As I said earlier, I do not know what will happen after both countries come to a negotiated settlement, everything you just said is just pure speculation. What I can say is it's important (after the war is over) for Ukraine and Russia to re-establish full diplomatic relationship and get along well, and Ukraine doesn't antagonize Russia with their desire to join NATO (not allowing Ukraine to join NATO will probably be part of the peace deal anyway). Russia seized Crimea and started the Donbass war because they felt threatened by Ukraine's desire to get closer to the west after they overthrew their elected pro-Russian president at Russia's expense. We can argue about how it is Ukraine's sovereign right to join NATO and choose who to be friends/enemies with, but from a pragmatic standpoint, it is important for Ukraine to get along with Russia as its neighbour. Failed diplomacy is the reason why the war started in the first place.
What I'm saying may sound like "might is right", but it is what it is. Ukraine just can't alienate Russia and not expect a response from Russia.
And let me say that there is absolutely no justification for Russia's invasion of Ukraine, even though their reasons for invading Ukraine is probably more sound than America's invasion of Iraq under the pretext of Iraq possessing nuclear weapon, and then getting away with ruining millions of Iraqi lives (because might is right), but as I said earlier, Ukraine has to be pragmatic and recognize that Russia is their neighbour and they have to get along for peace.