You mentioned that this cannot be said for a lot of EU countries. Turks born in EU do not have to learn German. Immigration within EU is free from language requirement too.
I do not even understand why do you think minorities not learning Serbian is impressive? Croatia and Kosovo both have schools that can use Serbian in their curriculum and no one is forcing Croatian on them. Similar things exist for Czech and Hungarian. No one is forcing these minorities to go to schools to learn Croatian.
> Didn't those two breakaway republics declare independence?
And were immediately annexed by Russia? How independent is that? Who's the new cultural head of these independent republics?