We know Russians take a very dim view of their soldiers who run or disobey orders. Well documented over several wars now. Then the above with the sledgehammered man. Awful stuff. Wagner is actually circulating that themselves. For an example I guess.
Then there is this. I'll just link since it is graphic.
https://www.reddit.com/r/RussiaUkraineWar2022/comments/ytwcmc/more_than_20_deceased_russian_troops_were/You have a row of what looks like their Donetsk recruits (red armbands) with look what look like head wounds. No weapons. Unknown what happened exactly of course but it is damn suggestive of battlefield executions. Since the footage comes from the Ukes doing recon, unlikely it is them. And to be honest, the Ukes do deserve some benefit of the doubt. Especially at this stage while I have personally seen the Russians execute several captured Ukes over the months.
The Russians are absolute monsters and the stuff they have done to their enemies often pales to what they have done to their own.