It's a good alternative to genocide. There are some conflicts that can't be resolved, and the only way to fix a relationship of mutual hatred is to either eliminate one of the parties or separate them.

Russians in the Baltics and in Ukraine are always going to vote in Russia's interest over that of their respective country. In the case of the Baltics, they refuse to go to their home country, as has been offered to them by programs from both the Baltic and Russian governments, and instead expect their country to come to them. It's something that can't be resolved, because asking one side to concede is asking them to fundamentally alter their identity. The only solution for Russians outside of Russia is a return to Russia.