DONETSK, December 5. /TASS/. A group of Ukrainian troops has been wiped out at a refractory plant in the city of Chasov Yar, a Russian security official told TASS.

"A large group of enemy troops was eliminated on the northeastern outskirts of the plant area. A mop-up operation is now underway," he said.

According to the official, enemy troops are defecting in large numbers in this section of the frontline.