Putin is suffering from the same kind of trauma that Hitler suffered from, just a bit different. Hitler had a WW1 trauma (personally as a soldier, and more universally with Germany getting destroyed and blamed and footed with the bills).
Putin still suffers a Cold War trauma (also personally => he was a spy, and more universally: Russia got its ass kicked and thrown backwards economically).
Both Hitler and Putin then and now want to compensate it by "making their country strong" and by occupying further land "for the needs of our people".
Both the people of Russia and Nazi Austro-Germany also have/had unwavering and blind trust in their Führer (Hitler/Putin).
Both peoples are also similarly xenophobic and fascist.
As you can see, there are some troubling similarities between them.
LOL
Otherwise: One more similarity is that the war/"war" ended with significant German/Russian minorities left in neighbouring countries. In the Soviet case that was an unnecessary error.