It looks to me (I am not a reliable source) like Russia won the war immediately. There will never be a stable, western aligned government in Ukraine again. But there will be a huge buffer zone that keeps NATO far from anything Russia considers dangerous.
There will never be a stable, western-aligned government again. There’s never gonna be a stable, eastern-aligned government either. The rightwing coups will never end. Ukraine is destroyed for the working class. The bourgeoisie might have one last chance to sell out and move to the US.
How you propose to reverse or even avoid this? Keel up before nazis and allow for genocide in Donbas and another yeltsinisation of Russia? This time maybe terminal since west seem helbent on balkanization of Russia.