Is it really ASB, though? While the Molotov-Ribbentrop Pact was officially a non-aggression pact, they secretly plotted to split up Eastern Europe according to German and Soviet interests. This gave western Poland to Germany, while Finland, the Baltic States, part of Romania, and eastern Poland was given to the USSR. The Germans were the ones with the industry but needed raw resources, while the Soviets were the ones with raw resources but desperately needed industrial goods for development. As a result of this, the USSR and Nazi Germany also agreed to assist each other with trade, with the Germans sending goods to the Soviets, and the Soviets sending raw materials such as grain and oil back. Finally, the USSR even offered to join the Axis Powers on 25 November 1940. While the Nazis and the USSR obviously weren't on the best of terms, not everyone in the Nazi Party was necessarily opposed to the idea of it being an ally. Also, some of the terms that Stalin had given (Germans departing Finland in exchange for wood and nickel shipping and peace with Finland; a mutual assistance pact with Bulgaria be signed in the next few months after Soviet bases have been permitted; south of Baku and Batumi (ports in modern Azerbaijan and Georgia) being the centre of Soviet territorial domination; affirm that the Soviet-Bulgaria mutual assistance treaty was a political necessity) weren't necessarily deal breakers for Germany. Perhaps Germany could be convinced to wait it out in his war against the USSR, and then lead it once the Western Allies have been defeated by this unholy alliance. And who says that Hitler needed to be leader of this? Goering wasn't the biggest fan of invading the USSR, and it's also important to remember that the "type" of Nazism under Hitler's regime wasn't the only form of Nazism; Strasserism was a form of Nazism that was more worker-based—hostile to Jews not from a racial, cultural or religious perspective, rather from an economic basis—to achieve a national rebirth. Maybe the alliance wouldn't be stable, but Nazi Germany as we know it allying with the USSR is not impossible in my opinion.