Well, the example that I know best are the Baltic countries and most of the Russian minority in those countries do speak Estonian or Latvian or Lithuanian fluently.

It's not a case of people in the Crimea speaking Ukrainian but whether they have the freedom for their own culture. We're not talking people who have lived in a country merely for decades either, we're often talking people that have lived in a country for generations, certainly back in the tsarists period of the Russian Empire.