To add to this conversation:
This is a horrible dilemma with two bad choices. What to do after a force of clear evil (in this case Russia, but there are other similar situations) invades your country, genocides and ethnically cleanses a part of it? ... You can (1) forfeit it and feel morally superior, but you're rewarding The Evil for their crimes and asking for a repeat; or (2) take back what's yours and deport the illegal invaders, but then every cockroach will crawl out and call you a nazi or somesuch. There is no good choice after being a victim of war crimes.