RBZS, you can make a case that Ukrainians might be guilty of something like what you say – they were close partners to Russians in Soviet Russia and now when they got their own state – and thus full responsibility for their actions, they might not have fully reconsidered some of the darker pages of their history.
Still, it is nonsense to discuss this in the context of the brutal invasion. Hashem punishes at his own level, we do not need to support (or not condemn) brutality. This is akin to Egyptians being at fault for prosecuting Jews, even as Hashem seemingly required it. You don’t have to be on the part of punishers. As Avraham Heschel writes about Spanish Jewry (really about German) – who were expelled right at the time of American acquisition – they were lucky to be victims (of inquisition) and not part of the perpetrators (of conquista)