Ukrainian President Volodymyr Zelenskiy, left, and Finnish President Sauli Niinist walk past guard of honor during their meeting in Kyiv, Ukraine, Thursday, Sept. 12, 2019. ( AP Photo/Efrem Lukatsky)

Ukrainian President Volodymyr Zelenskiy, left, and Finnish President Sauli Niinist talk as they walk past guard of honor during their meeting in Kyiv, Ukraine, Thursday, Sept. 12, 2019. ( AP Photo/Efrem Lukatsky)

Ukrainian President Volodymyr Zelenskiy, left, and Finnish President Sauli Niinist talk as they walk past guard of honor during their meeting in Kyiv, Ukraine, Thursday, Sept. 12, 2019. ( AP Photo/Efrem Lukatsky)

Ukrainian President Volodymyr Zelenskiy, right, welcomes his Finnish counterpart Sauli Niinist during their meeting in Kyiv, Ukraine, Thursday, Sept. 12, 2019. ( AP Photo/Efrem Lukatsky)

Ukraine's President Volodymyr Zelensky (C-R) and Finnish President Sauli Niinisto (C-L) review the Ukrainian guard of honour during a welcome ceremony at Mariyinsky palace in Kiev on September 12, 2019. - Niinist? is in Ukraine for a two-day state visit. (Photo by Sergei SUPINSKY / AFP)

A security officer reviews members of the Ukrainian guard of honour prior to a welcoming ceremony attended by Ukraine's President and Finnish President at Mariyinsky palace in Kiev, on September 12, 2019. - Finnish President Sauli Niinisto is in Ukraine for a two-day state visit. (Photo by Sergei SUPINSKY / AFP)

A security officer reviews members of the Ukrainian guard of honour prior to a welcoming ceremony attended by Ukraine's President and Finnish President at Mariyinsky palace in Kiev, on September 12, 2019. - Finnish President Sauli Niinisto is in Ukraine for a two-day state visit. (Photo by Sergei SUPINSKY / AFP)

A security officer reviews members of the Ukrainian guard of honour prior to a welcoming ceremony attended by Ukraine's President and Finnish President at Mariyinsky palace in Kiev, on September 12, 2019. - Finnish President Sauli Niinisto is in Ukraine for a two-day state visit. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - Ukraine's President Volodymyr Zelensky (C-R) and Finnish President Sauli Niinisto (C-L) review the Ukrainian guard of honour during a welcome ceremony at Mariyinsky palace in Kiev on September 12, 2019. - Niinist? is in Ukraine for a two-day state visit. (Photo by Sergei SUPINSKY / AFP)

President of Finland Sauli Niinist? (R) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

Ukraine's President Volodymyr Zelensky during welcoming ceremonies of Finnish President Sauli Niinist? in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

Ukraine's President Volodymyr Zelensky speaks during his joint press conference with visiting President of Finland Sauli Niinist? (not in picture) in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

Ukraine's President Volodymyr Zelensky speaks during his joint press conference with visiting President of Finland Sauli Niinist? (not in picture) in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during their joint press conference in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

Ukraine's President Volodymyr Zelensky gestures during the official talks with Finnish President Sauli Niinist? in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky shake hands during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during their joint press conference in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during their joint press conference in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (R) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on an official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on an official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on an official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (R) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on an official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (R) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on an official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during their joint press conference in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky during their joint press conference in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (L) and Ukraine's President Volodymyr Zelensky in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.

President of Finland Sauli Niinist? (R) and Ukraine's President Volodymyr Zelensky during welcoming ceremonies in Kiev, Ukraine on Thursday, 12th Sep., 2019. President Niinist? is in Ukraine on a two-day official visit. LEHTIKUVA / ANTTI AIMO-KOIVISTO - FINLAND OUT. NO THIRD PARTY SALES.