While I'm perfectly willing to believe the Russians are torturing people and executing people. (I've seen them do it live) Let's also remember that manipulation is still happening on both sides. Remain skeptical of everything posted online. A body in a grave in Ukraine may be just that, Or it may not be a body, a grave, or in Ukraine, or any combination.
Side note: Honestly, this is what a war looks like. The US doesn't play by these rules, mostly because we are strong enough we don't have to, but when you have near-peer foes, fighting in cities and towns, this is what happens. This or worse. My quip a couple pages ago about not wanting to have to shoot "allies" because of war crimes is based on knowing folks that have had to do exactly that. Or be complicit. And that's a shitty decision to make.