Further to 1)

The people in Donbas and Crimea were not allowed to vote in the 2014 coup 'election'. So further to 2) Crimean tatars had been deprived of their right to vote, so had their own emancipation vote and decided to rejoin Russia. Put it in context: What would Texas do, if the Federal goverment said one day that Texan votes do not count, or Texas is not allowed to participate in the presidential election? The cheating is bad enough.

Also, if a country starts 'punishing' whole states for voting wrongly, or depriving them of votes because they'll probably vote wrongly, then that government loses all rights to govern those states, IMO.

Not only that, the Western Ukrainians doubled down and started a wee genocide as in point 4). So, yeah, nah. Stop bleating about 1991 borders. It ain't gonna happen.