Russia can go wherever they want and the problem won't be resolved. It's not about what countries are involved in Ukraine, it's about why countries feel the need to go there in the first place. Ukraine, like Haiti, Syria, and Sudan - to name a few more - is a site of inter-capitalist rivalry

You can get peace - sure - but the Ukrainian economy will be subjugated to whoever the 'victor' is. You can argue that economic integration reduces conflict and wars, but what will remain is a sort of neo-colonial relationship; or a dependency of sorts. That's what I have an issue with.

But that is the only realistic outcome - that exact economic dependency on one power or another (whether that be the US, the EU, or even Russia, or even a mixture, say, for instance, the EU+US or EU+Russia)

There are no liberationary movements in Ukraine to my knowledge, just a reactionary military regime where political rights have been greatly reduced, even by liberal standards for governance. It is exceptionally rare that a country caught between two capitalist rivals gets the ability to form their own sovereign and independent liberation