Ukraine isn't getting into NATO. People might publicly pretend but one of two things ends up true.
1) Russia is defeated so badly in Ukraine that they cease to have a functional military (outside of, perhaps, their nuclear forces). In which case NATO is basically irrelevant as the enemy is gone.
or
2) The war continues in some combination of hot and cold. In which case the US will veto NATO membership even if all of Europe was in favor (and they wouldn't be) because adding Ukraine to NATO while it is in a state of war with Russia starts full blown WW3 and the nukes fly.
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Russia is committed to this war to the bitter end. They will continue to fight Ukraine until Russia becomes physically unable to continue the fight and/or victory is achieved. And ultimately, Russia probably would go nuclear if it perceived that as the only way to win in Ukraine.
For Russia this is an existential war that is has already paid the economic price for fighting. And it is a war that the entire Russian political establishment (even the opposition) is largely on board with and intends to fight to the bitter end.
Russia is absolutely willing, and able, to embrace massive war crimes if it perceives a tactical or strategic advantage in doing so and massively outnumbers Ukraine. The kill ratio that Ukraine needs to maintain is, frankly, fairly absurd.
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Unless Europe gets another incredibly mild winter, it is also going to have enormous problems come fall & winter. Because Europe really hasn't done much of anything constructive with the time they gained with last winters reprieve.