A pro-Russian gunman takes cover behind a tree during shooting near the airport, outside Donetsk, Ukraine, on Monday, May 26, 2014. Ukraine's military launched air strikes Monday against separatists who had taken over the airport in the eastern capital of Donetsk in what appeared to be the most visible operation of the Ukrainian troops since they started a crackdown on insurgents last month. (AP Photo/Vadim Ghirda)
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