A pro-Russian man stands guard at a checkpoint which was left by Ukrainian security force officers near Slaviansk April 24, 2014. Ukrainian forces said they had killed several pro-Russian militants in clashes 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
