A Ukrainian security force officer is deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk April 24, 2014. Ukrainian forces clashed with pro-Russian militants as they closed in on the separatist-held city of Slaviansk on Thursday, seizing rebel checkpoints and setting up roadblocks as helicopters circled overhead. Reuters journalists saw a Ukrainian detachment with five armoured personnel carriers take over the checkpoint on a road north of the city in late morning after it was abandoned by separatists who set tyres alight to cover their retreat. (Photo by Gleb Garanich/Reuters)
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