"The corpses of 13 Ukrainian servicemen were brought in today," Ruslan Fedonyuk, director of the morgue in the government-held town of Artemivsk, told AFP.
"They delivered them this morning and we have now organised a vehicle that will collect them and transport that for further autopsies and registration," he said.
An AFP journalist at the scene saw body bags containing five corpses lying next to a refrigerated van parked outside the morgue and another five bodies wearing camouflage covered by sheets inside.
Government forces today retreated from the flashpoint town of Debaltseve, in a bitter defeat for Kiev following weeks of fierce battles with pro-Russian rebels.
Ukraine and the US has accused Russia of piling in troops and weapons to spearhead the assault, which continued despite the start of a nominal ceasefire on Sunday.
