Psychologically, Hitler and Putin are two very different people. Read Mein Kampf.

Vladimir Putin is a sociopath but not a Napoleon or a Hitler. Russian-majority regions of the Donbass voted to join Russia in 2015 but Putin did nothing at that time. However, once Ukraine made it clear it was joining NATO - that bring the enemy to his borders. So Putin launched the invasion.

His motive is to protect Russia's borders, not to conquer Europe.