Images from Ukraine
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Presidential candidate Petro Poroshenko meets with supporters in the Cherkasy region, central Ukraine, May 20, 2014.
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A pro-Russian militant defends a front line position with a machine gun, Slovyansk, Ukraine, May 19, 2014.
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Residents watch the flames from a damaged gas pipe that was hit by a mortar bomb, during fighting between Ukrainian government troops and pro-Russian militants, outside Slovyansk, Ukraine, May 19, 2014.
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Pro-Russian militants detain three men they suspect of spying for the Ukrainian government in Kramatorsk, eastern Ukraine, May 18, 2014.