Turkey's President Recep Tayyip Erdogan, left, walks with Ukraine's President Vladimir Zelenskiy, centre, as they review an honour guard during a welcome ceremony prior to their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, left, walks with Ukraine's President Vladimir Zelenskiy, centre, as they review an honour guard during a welcome ceremony prior to their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, stands with Ukraine's President Vladimir Zelenskiy, during a welcome ceremony prior to their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, shakes hands with Ukraine's President Vladimir Zelenskiy, prior to their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, shakes hands with Ukraine's President Vladimir Zelenskiy, left, prior to their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, sits with Ukraine's President Vladimir Zelenskiy,during their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, left, walks with Ukraine's President Vladimir Zelenskiy, centre, as they review an honour guard during a welcome ceremony prior to their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, sings his country's national anthem during a welcome ceremony for Ukraine's President Vladimir Zelenskiy, ahead of their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Turkey's Defence Minister Hulusi Akar says his country would like to establish a safe zone in northeast Syria jointly with the United States but would act alone if necessary.(Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, reviews an honour guard prior to a welcome ceremony for Ukraine's President Vladimir Zelenskiy, at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Turkey's Defence Minister Hulusi Akar says his country would like to establish a safe zone in northeast Syria jointly with the United States but would act alone if necessary.(Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, looks at Ukraine's President Vladimir Zelenskiy, left, during their joint media conference after their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, shakes hands with Ukraine's President Vladimir Zelenskiy, left, following their joint media conference after their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, shakes hands with Ukraine's President Vladimir Zelenskiy, left, following their joint media conference after their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan, right, shakes hands with Ukraine's President Vladimir Zelenskiy, left, following their joint media conference after their meeting at the Presidential Palace in Ankara, Turkey, Wednesday, Aug. 7, 2019. Zelenskiy is in Turkey on a two-day official visit. (Presidential Press Service via AP, Pool)

Turkey's President Recep Tayyip Erdogan (L) and Ukraine's President Volodymyr Zelensky (R) review a guard of honor during an official welcoming ceremony at the Presidential Complex in Ankara on August 7, 2019. (Photo by Adem ALTAN / AFP)

Turkey's President Recep Tayyip Erdogan (L) and Ukraine's President Volodymyr Zelensky (R) review a guard of honor during an official welcoming ceremony at the Presidential Complex in Ankara on August 7, 2019. (Photo by Adem ALTAN / AFP)

Turkey's President Recep Tayyip Erdogan (L) and Ukraine's President Volodymyr Zelensky (R) review a guard of honor during an official welcoming ceremony at the Presidential Complex in Ankara on August 7, 2019. (Photo by Adem ALTAN / AFP)

Turkey's President Recep Tayyip Erdogan (R) shakes hand with Ukraine's President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara on August 7, 2019. (Photo by Adem ALTAN / AFP)

Turkey's President Recep Tayyip Erdogan (R) shakes hand with Ukraine's President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara on August 7, 2019. (Photo by Adem ALTAN / AFP)

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) welcomes Ukrainian President Volodymyr Zelensky (L) with an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) stands next to Ukrainian President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) stands next to Ukrainian President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) stands next to Ukrainian President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd L) welcomes Ukrainian President Volodymyr Zelensky (3rd L) with an official ceremony in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) welcomes Ukrainian President Volodymyr Zelensky (R) with an official ceremony in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) welcomes Ukrainian President Volodymyr Zelensky (L) in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) meets Ukrainian President Volodymyr Zelensky (L) in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) meets Ukrainian President Volodymyr Zelensky (L) in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan arrives to welcome Ukrainian President Volodymyr Zelensky (not seen) with an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) welcomes Ukrainian President Volodymyr Zelensky (L) with an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) stands next to Ukrainian President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) stands next to Ukrainian President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) stands next to Ukrainian President Volodymyr Zelensky (L) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan arrives to welcome Ukrainian President Volodymyr Zelensky (not seen) with an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky is being welcomed by Turkish President Recep Tayyip Erdogan (not seen) during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Leader of Crimean Tatars Mustafa Abdel Dzhemilev (R) shakes hands with Ukrainian President Volodymyr Zelensky (L) during Zelensky's official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Leader of Crimean Tatars Mustafa Abdel Dzhemilev (R) shakes hands with Turkish President Recep Tayyip Erdogan (C - L) during Ukrainian President Volodymyr Zelensky's (not seen) official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Leader of Crimean Tatars Mustafa Abdel Dzhemilev (R) meets with Turkish Foreign Minister Mevlut Cavusoglu (L) during Ukrainian President Volodymyr Zelensky's (not seen) official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Leader of Crimean Tatars Mustafa Abdel Dzhemilev (R) meets with Turkish Foreign Minister Mevlut Cavusoglu (L) during Ukrainian President Volodymyr Zelensky's (not seen) official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (C - R) and Ukrainian President Volodymyr Zelensky (C - L) stand next to each other during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky hold a committeelateral meeting following their meeting at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) welcomes Ukrainian President Volodymyr Zelensky (L) in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd R) welcomes Ukrainian President Volodymyr Zelensky (R) with an official ceremony in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan arrives to welcome Ukrainian President Volodymyr Zelensky (not seen) with an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Kayhan Ozer / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / CEM OKSUZ / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) and Ukrainian President Volodymyr Zelensky (2nd L) walk past the honour guards during an official welcoming ceremony at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Cem Oksuz / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) meets Ukrainian President Vladimir Zelenskiy (L) in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) meets Ukrainian President Vladimir Zelenskiy (L) in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd L) welcomes Ukrainian President Vladimir Zelenskiy (3rd L) with an official ceremony in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (L) welcomes Ukrainian President Vladimir Zelenskiy (R) with an official ceremony in Ankara, Turkey on August 07, 2019. TURKISH PRESIDENCY / KAYHAN OZER / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C-2nd L) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (Front 2nd L) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (R) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (2nd R) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (L) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President, Volodymyr Zelensky (C) visits Anitkabir, the mausoleum of Turkish Republic's Founder Mustafa Kemal Ataturk, in Ankara, Turkey on August 07, 2019. Fatih Kurt / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish and Ukrainian officials pose for a photo as they exchange files following a joint press conference of Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Chairman of the Turkish Space Agency Serdar Huseyin Yildirim (2nd R) and an Ukrainian official sign a cooperation agreement between two countries following a joint press conference of Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Chairman of the Turkish Space Agency Serdar Huseyin Yildirim (R) and an Ukrainian official pose for a photo after signing a cooperation agreement between two countries following a joint press conference of Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo following a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo following a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky makes a speech during a joint press conference with Turkish President Recep Tayyip Erdogan (not seen) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo following a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo following a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky makes a speech during a joint press conference with Turkish President Recep Tayyip Erdogan (not seen) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky makes a speech during a joint press conference with Turkish President Recep Tayyip Erdogan (not seen) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky (L) makes a speech during a joint press conference with Turkish President Recep Tayyip Erdogan (R) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky makes a speech during a joint press conference with Turkish President Recep Tayyip Erdogan (not seen) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (not seen) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Ukrainian President Volodymyr Zelensky makes a speech during a joint press conference with Turkish President Recep Tayyip Erdogan (not seen) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo following a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) shake hands as they pose for a photo following a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference at Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd L) and Ukrainian President Volodymyr Zelensky (L) arrive to hold a press conference at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Murat Cetinmuhurdar / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish and Ukrainian officials attend a signing ceremony following a joint press conference of Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish and Ukrainian officials attend a signing ceremony following a joint press conference of Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Murat Cetinmuhurdar / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish Vice President Fuat Oktay, Turkish Foreign Minister Mevlut Cavusoglu, Turkish Interior Minister Suleyman Soylu and Turkish National Defense Minister Hulusi Akar attend the joint press conference of Turkish President Recep Tayyip Erdogan and Ukrainian President Volodymyr Zelensky at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Murat Cetinmuhurdar / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd R) and Ukrainian President Volodymyr Zelensky (R) hold a press conference at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Murat Cetinmuhurdar / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd L) and Ukrainian President Volodymyr Zelensky (L) arrive to hold a press conference at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Murat Cetinmuhurdar / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "TURKISH PRESIDENCY / MURAT CETINMUHURDAR / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Turkish President Recep Tayyip Erdogan (2nd L) and Ukrainian President Volodymyr Zelensky (L) arrive to hold a press conference at the Presidential Complex in Ankara, Turkey on August 07, 2019. Turkish Presidency / Murat Cetinmuhurdar / Handout / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at the Presidential Complex in Ankara, Turkey on August 07, 2019. Murat Kula / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a press conference at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) makes a speech during a joint press conference with Ukrainian President Volodymyr Zelensky (L) at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 07: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a press conference at the Presidential Complex in Ankara, Turkey on August 07, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

ANKARA, TURKEY - AUGUST 7: Turkish President Recep Tayyip Erdogan (R) and Ukrainian President Volodymyr Zelensky (L) hold a joint press conference in Ankara, Turkey on August 7, 2019. Metin Aktas / Anadolu Agency/ABACAPRESS.COM