A Ukrainian helicopter Mi-24 gunship fires its cannons against rebels at the main terminal building of Donetsk international airport May 26, 2014.Three Ukrainian helicopter gunships mounted a heavy attack on the rebel-held international airport terminal at Donetsk on Monday, firing rockets and cannon and throwing out decoy flares as militants shot at them from the ground. REUTERS/Yannis Behrakis (UKRAINE – Tags: POLITICS CIVIL UNREST CONFLICT MILITARY TRANSPORT) – RTR3QY56