Ukraine’s president has called for U.N. peacekeepers to help in an anti-terror operation against separatists.
A pro-Russia protester breaks a piece of stone at a barricade outside a regional government building in Donetsk, in eastern Ukraine, April 15, 2014.
A female member of a "Maidan" self-defense unit stands guard in front of the Ukrainian parliament building in Kyiv, April 15, 2014.
Ukrainian soldiers stand near amored personnel carriers that fly a Ukrainian flag, as the Ukrainian army troops receive ammunition in a field on the outskirts of Izyum, eastern Ukraine, April 15, 2014.
People stand at a barricade at the regional administration building that Moscow loyalists had seized earlier in Donetsk, Ukraine, April 15, 2014.