It is not just about Ukraine. It is about building the system of equal rights and equal security in Europe (AKA demilitarization and de-nazification of the whole Europe) and building multipolar world. If you don't kill Russians - Russians don't kill you and peace is possible. If you believe that somebody (anybody) have right to discriminate, abuse and kill Russians - the peaceful coexistence is impossible.And if Russia were to take Ukraine, you think that WW3 would not be costly?