KIEV, UKRAINE - FEBRUARY 22: People look at a heavy tank that is part of an exhibition of weapons, drones, documents and other materials the Ukrainian government claims it recovered in eastern Ukraine and prove direct Russian involvement in the fighting between Ukrainian troops and pro-Russian separatists on February 22, 2015 in Kiev, Ukraine. Russia has denied sending heavy weaponry to the separatists, admitting only that Russian volunteers are participating in the fighting. (Photo by Sean Gallup/Getty Images)
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