A pro-Russian rebel looks up while riding on a tank flying Russia's flag, on a road east of Donetsk, eastern Ukraine, in this Sunday, July 29, 2015, file photo. (AP Photo/Vadim Ghirda, File)
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A pro-Russian rebel looks up while riding on a tank flying Russia's flag, on a road east of Donetsk, eastern Ukraine, in this Sunday, July 29, 2015, file photo. (AP Photo/Vadim Ghirda, File)
