How do you know?
The World Putin Wants: How Distortions About the Past Feed Delusions About the Future
Putin also just released this latest foreign policy initiative, which is very similar to Hitler's Anschluss plan:
Putin approves new foreign policy doctrine based on 'Russian World'
Vladimir Putin backs foreign policy doctrine to 'protect ideals of Russian World'
Just replace the word 'Russian' with 'German' and you'll get the idea.