A Ukrainian security force officer is deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk

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 troops were digging in to a new position a few miles from the separatist-held city of Slaviansk early on Thursday, a Reuters correspondent said. Dozens of soldiers in camouflage uniform, some wearing airborne patches, were setting up sandbag defences around at least six BMD light armoured vehicles and putting up a tent near a settlement called Malynivka, some 12 km (8 miles) south of Slaviansk on the main road to the regional capital Donetsk. REUTERS/Gleb Garanich (UKRAINE)