Well, Marx, and many leaders of the Russian revolution were Jewish. Jews in the top echelon of the Communist Party during its early days in power included Yakov Sverdlov, its executive secretary; Grigori Zinoviev, head of the Communist International; press commissar Karl Radek; foreign affairs commissar Maxim Litvinov; as well as Lev Kamenev and Moisei Uritsky. But that was only an excuse, a subterfuge for Hitler, as the Georgian Stalin showed his colors, purging the Jewish leaders from the party long before the war. The real goal for the Nazis wasn't the Jews in Russia and eastern Europe, but resources and labor. Labor to free German men for soldiering. We know how that did not work out thanks to the Russian winters, and the inevitable sabotage resistance in the factories. It's easy to lose sight of Hitler's vision of the German future for his insane hatred of Jews.
War with Russia was also a conflict of egos, both wanting to rule the world. A recognition of each other in the other. Stalin signed a pact with Hitler to buy time. He knew what was coming, and thought Hitler would be busy on the western front, but the English Channel and RAF changed his mind. Stalin's move into Poland was for creating a buffer to bear the first assault on the east. Didn't do him or Russia much good. And from history we well know the animosity for Poland in Russia, as Poland took part in the many Swedish Empire vs Russia wars. Nothing simple or superficial in the motive of both monsters suffices.