Prof. Michael. #Clarke about Russian human waves:

"They brought criminals out of prison who go on the attack in the front line. They are mobilized behind them and only in the third row are the soldiers of the regular units... they literally throw men into the attack. They are literally human waves."

Soldiers of the Russian army fighting in the front line, but only in the third line, act as "blockers". “Their job is to shoot anyone who retreats. In other words, you go forward or you get shot…”