By doing maximalist territorial claims based on the historical boundaries of the Russian Empire, they directly threatened Finland, Estonia, Latvia, Lithuania, Poland and Romania just in the European Union. Even Hitler didn’t make such bold claims before WW2.
2 is actually required to be logically consistent with their psychopathic propaganda. Most of the Russian argument to invade Ukraine in diplomatic and legal channels is recycled from Hitler’s argument to invade Poland (they just replaced Danzig with Donbas).