Ukraine President Petro Poroshenko, left, and Lithuanian President Dalia Grybauskaite review the honor guard during a welcome ceremony ahead of their meeting in Kiev, Ukraine Friday, Dec. 7, 2018. (Mykola Lazarenko, Presidential Press Service via AP)

President of Ukraine Petro Poroshenko, right, presents an award to Lithuanian President Dalia Grybauskaite during their meeting in Kiev, Ukraine, Friday, Dec. 7, 2018. (Mykola Lazarenko/Presidential Press Service via AP)

This handout picture taken and released by Ukraine presidential press-service shows Ukrainian President Petro Poroshenko (L) and Lithuanian President Dalia Grybauskaite walking in front of the guard of honor during a welcoming ceremony ahead of their meeting in Kiev on December 7, 2018. (Photo by Mykola Lazarenko / UKRAINIAN PRESIDENTIAL PRESS SERVICE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / UKRAINIAN PRESIDENTIAL PRESS-SERVICE/ MYKOLA LAZARENKO" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

This handout picture taken and released by Ukraine presidential press-service shows Ukrainian President Petro Poroshenko (L) and Lithuanian President Dalia Grybauskaite walking in front of the guard of honor during a welcoming ceremony ahead of their meeting in Kiev on December 7, 2018. (Photo by Mykola Lazarenko / UKRAINIAN PRESIDENTIAL PRESS SERVICE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / UKRAINIAN PRESIDENTIAL PRESS-SERVICE/ MYKOLA LAZARENKO" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS