In all fairness, unlike Poland in 1939, Ukraine is not a country that managed to wage war against almost every single of their neighbours in the 20 years before the bigger fish came taking a bite.
That doesn't make Hitler any less a criminal - it just explains how his casus belli sounded more believable back in the day.
If we are comparing history, let's get the whole picture.
Hitler was actually quite open about his "conquest for living space" project and goals. It was believable only if you wanted to believe and afaik, they did not believed him at the time.
They mostly thought they are not ready for the full scale war yet, but that is different calculation.
Pretty funny how open people sometimes are about intentions and goals, and still nobody believes them. Personally, I think people like Xi and Putin can be taken, when it comes to strategic goals, taken by their word. Which is scary in itself, also scary that nobody seems to do exactly that.
Hitler's casus belli was already bullshit back the day. And the whole East of Europe, from the eastern border of Germany to the Russian pacific coast was at war following WW1. With quite a lot of external intervention I might add.
That doesn't make Hitler any less a criminal - it just explains how his casus belli sounded more believable back in the day.
If we are comparing history, let's get the whole picture.