You'd prefer them to be executed like Ukrainian "oligarch battalions" usually do with their POWs?
Anyway. It was just a convenient reminiscence to Moscow event in 1944, and a message to Kiev. No one was hurt or beaten: few insults, hurdled eggs and rotten tomatoes can be hardly compared to hundreds of civilians killed or crippled by indiscriminative shelling of cities by Ukrainian forces. Yeah, let's start a drama about this harmless parade, while pretending that we're not seeing war crimes and huge humanitarian catastrophy caused by Kiev

"like Ukrainian "oligarch battalions" usually do with their POWs" except you don't have a single piece of evidence of that apart from usual RT bullshit, right?
"hundreds of civilians killed or crippled by indiscriminative shelling of cities by Ukrainian forces" you mean by DNR and LNR forces, right?
"humanitarian catastrophy caused by Kiev" you mean started by Moscow, right?