There have been several instances of Azov Battalion Nazis posting their torture and murder of Russian POW’s online. There’s no question they are doing it. I have yet to see counter examples but I have no doubt now the Russians will respond in kind toward a lot of Ukrainian POWs.
and for the record, these are crimes. Ukraine is a signatory to the Geneva Convention. Those committing such acts are unquestionably war criminals.
The Russians aren’t going to torture any legit combatants because they follow laws.