FILE - Bosnian Serb military chief Ratko Mladic enters the Yugoslav War Crimes Tribunal to hear the verdict in his genocide trial, in The Hague, Netherlands, on Wednesday, Nov. 22, 2017. Survivors of war crimes committed during Bosnia’s 1992-95 war say the victims of ongoing human rights abuses in Ukraine should learn from their experience of fighting for justice, but that they must first make peace with the fact that reaching it will inevitably be a lengthy and painful process. It took decades to arrest and try the wartime Bosnian Serb leaders, and three decades since the start of that war more than 7,000 people remain unaccounted-for. (AP Photo/Peter Dejong, Pool, File)