A pro-Russian separatist guards a checkpoint as tyres burn behind him near the town of Slaviansk in eastern Ukraine May 2, 2014. Ukraine launched a “large-scale operation” to retake the eastern town of Slaviansk, pro-Russian separatists there said on Friday, in an escalation of violence in what has become the worst confrontation between Russia and the West since the Cold War. (Photo by Baz Ratner/Reuters)
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