That's literally how tyrants justify their atrocities. Everyone always calls up the historical sins of the other side and thus paints all members of that race as undeserving of human compassion or mercy. You can have compassion for anyone regardless of their skin color. If you define the Ukrainians solely as "oppressors" because they're white and some of them are racist, and thus declare that they aren't worthy of compassion anymore, then it's just as easy for others to paint the Jews as undeserving of compassion, the Tutsi as underserving of compassion, the Bosnian Muslims as undeserving of compassion, etc.