DONETSK, UKRAINE - MAY 7: A man prepares ballots and flyers for a planned referendum seeking greater autonomy from the central government in Kiev, scheduled for May 11, in a building occupied by pro-Russian protesters on May 7, 2014 in Donetsk, Ukraine. Tensions in Eastern Ukraine are high after pro-Russian activists seized control of at least ten cities ahead of the Victory Day holiday and a planned referendum on greater autonomy for the region. (Photo by Brendan Hoffman/Getty Images)