MOSCOW, August 20. /TASS/. The Ukrainian military command is withdrawing its 129th separate heavy mechanized brigade from the Sumy area to replenish losses, a source in Russian defense circles told TASS on Wednesday.

"In the Sumy direction, the Ukrainian military command is withdrawing most units of the 129th separate heavy mechanized brigade to replenish losses, leaving behind the 237th battalion of that brigade," the defense source said.

Russian defense circles said earlier that the Ukrainian military command was deploying units of over 40 brigades and regiments from various frontline areas to the Sumy and Kharkov directions and that Kiev forces were suffering casualties.