Plenty of languages that have fewer percentage of speakers than Russian in the Ukraine are official languages in the EU. And I'm not aware of any civilized country deliberately targeting particular minority languages for discrimination like the Ukraine did in regard to Russian, Belarusian and Yiddish.

And you do know why there are few Yiddish speakers in the Europe now, right? Yiddish might have been an official language somewhere in the EU if not for mass extermination of Jews. In which Ukrainian heroes took part [0].

[0] https://en.wikipedia.org/wiki/Ukrainian_Insurgent_Army#Holoc...