...defining victory for Ukraine is "Russia Goes Home, Gains Nothing". I would say Ukraine could win.
...defining victory for Russia is they take a country they cannot hold and get to participate in a guerilla war with people who look like them and who speak their language.
Russia can die of a million pinpricks or they can quit being assholes.

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!