Ukrainian President Volodymyr Zelenskiy, center, Defense Minister Andriy Zahorodnyuk, left, and Chief of General Staff Lieutenant General Ruslan Khomchak attend a commemorating ceremony to honor soldiers killed as they defended Donetsk airport in 2014-15 in a war conflict with Russia-backed separatists in Kyiv, Ukraine, Monday, Jan. 20, 2019. Ukraine has asked the Organization for Security and Cooperation in Europe to expand its monitoring mission in the country, Foreign Minister Vadym Prystaiko said Monday after a meeting with the organization's chairman. (Ukrainian Presidential Press Office via AP)