“Commonly forgotten in history is the fact that BOTH the Third Reich and the Soviet Union started WWII together.”
Hitler offered Stalin the chance to recover Polish lands that were lost to Russia due to WW1 and the Bolshevik Wars that followed.
Stalin jumped at the chance.
Which gave him the confidence and “justification” to give the Bessaribia Ultimatum to Romiania some months later.
Ironically, Hitler in the early 30s offered Pilsudski an opportunity to reclaim Soviet lands for Poland if he aligned with Hitler against Russia, knowing of Pilsudski’s hatred of the Russians, but Pilsudski, wisely did not trust Hitler enough to take the deal.