My Ancestors were Germans living in the Czech republic in the since the mid 1800’s and they would have gladly joined Germany vs the Ukrainians or the Russians communists.
Democrats are all about “Democracy”, so Let them Vote. If they vote to be part of Russia, there you go.
Same with any county of any state. Let them Vote.
If the Czechs and Slovaks could peacefully divorce, I don’t see why it isn’t possible here.