It should also be noted that the blood enemies of the national socialists were the communists, and the people behind the communists held power in Soviet Russia, people who had tried multiple communist revolutions in Weimar Germany before the NSDAP took power. The Germans probably knew they'd have no peace in their lifetime so long as Soviet Russia remained. I also wonder if the Germans knew what the Soviets were doing to the ethnically White Russians, like in the Holodomor.