You have asked a question about Germany which I will answer. You fail to fifferentiate here betwen an artificially created state which from its beginnings always had linguistic minority areas and one which has become multi cultural through immigration. The parallels in Europe to the first case would be Belgium and Switzerland, neither of which have one national language - in Eastern Europe it would have been Yugoslavia and Czechoslovakia. How would Belgians react if suddenly French was the only official language there ? Or Swiss German in Switzerland ? Of course in those countries the various linguistic areas are represented in their parliament. Germany only has the one indigenous linguistic area other than German and that is in Schleswig Holstein - the South Schleswig Voters Association (Sudschleswigscher Wahlerverband = SSW) this is a Danish minority party which is the only political party in Germany which is not required to reach the 5% hurdle in order to get into parliament. There are about three and a half million Russian speakers in Germany but they are an immigrant group not an indigenous one. They all have voting rights but the idea of them having official political representation is about the same as saying there should be Pakistani representation in Westminster.And I wonder why Ukraine and the other Baltic/Scandinavian countries want to join NATO? Would it maybe because they're otherwise at threat from being invaded by Russia?
Would you like Russia to 'liberate' Germany in the same way? You mentioned there are lots of Russian speakers there, are they represented in Parliament?
The Ukraine was first created as a state within the USSR in 1953 and, because relations were cordial then, the outer borders of it included indigenous Russian speaking areas - just as Polish and Hungarian - the borders were artificial ones which did not correspond to any natural borders of ethnicity or language. This is a completely different case to Germany .

