Ukraine said on Tuesday its forces had captured a group of Russian paratroopers who had crossed into Ukrainian territory on a "special mission" — but Moscow said they had ended up there by mistake.
The Ukrainian military meanwhile reported pro-Russian separatist forces were shelling the town of Novoazovsk and buildings there, including a hospital, were ablaze.
Twelve Ukrainian soldiers had been killed and 19 wounded in the past 24 hours, military spokesman Andriy Lysenko said.