IOTL, Stalin suffered a major nervous breakdown just after Barbarossa began, but recovered from it in time to give the Red Army commands. How is history changed if he never recovers? Does someone in hte Red Army launch a coup d'etat against him, and if so, who? Do the generals assume operational command early enough to repel the Nazis, or does their paralysis and reluctance to act without orders lead to a German victory in the East? If so, how long does WWII last once the Germans start getting nuked?