> for the same reasons that Hitler claimed that the Sudetendeutsche are the same people as the Germans

Indeed, but Hitler is not famous for mass-murdering the Sudetendeutsche.

And I never claimed that Russia invaded Ukraine for humanitarian reasons. I think it did because it could not tolerate a Ukraine fully integrated in the West and NATO- but this just means exercising political control over Ukraine, it doesn't imply an ethnic cleansing or genocide of Ukrainians.