Given Putin's likely to ramp up the warcrimes either way, this might be the non-NATO equivalent of that "risk nuclear war actually stepping in now, or he's gonna do even worse shit later" worry I've had before. If Ukraine is in a position to actually go on the offensive, it'll definitely risk escalating things more, but if there's no signs that Putin's going to actually stop (and that he can't be stopped internally), then it may be a required bit of pressure and risk.
Though that does mean the risk of Russian civilian casualties as well, but as I've also said before. War's war, and war sucks for basically everyone but the people at the top profiting from it, whether it be from sanctions of violence it's all going to affect the ordinary people disproportionately. A dead Russian, Ukrainian, soldier or civilian, is a dead human all the same. The only thing close to a "good" outcome in a shitty situation like this is whether any given death is worth more than one death prevented in the future. :/
I get it, everybody thinks the worst of Russia, but let's not keep running straight to the scenario that ends the world. I doubt Putin wants to die, and there's only a small chance that choosing the literal nuclear option DOESN'T end with him and possibly much of the world (or at least much of Russia) dead.
Once again, a number of dangerous precedents for future military actions have already been set. We're at the point where, if Russia doesn't properly given in and admit defeat (ideally with Putin on the end of a rope, but even if he stays in power being forced to accept
status quo ante bellum will color the lessons being learned here), then this is just going to keep happening, and not just to Ukraine. Eventually either a line that can't be crossed will be crossed, and we get WWIII anyway, or we slide into something much darker than that.
We've already reached the point where the only hope is that what is happening now actually gets us the absolute best possible outcomes. Any less than that, and we'll already be stuck in a "risk WWIII by intervening NOW, or else WWIII's gonna happen anyway later on, and probably on Putin's terms" situation before we can even react to it.