 Instead, Leon Trotsky takes advantage of the power vacuum in the post-Stalinist Soviet Union, returns from exile in Mexico, and assumes power in his stead.Therefore, there is still a Nazi-Soviet Pact, but Operation Barbarossa does not occur because the USSR rearms to the same extent as Nazi Germany.Moreover, Trotsky declares war on Nazi Germany before it can launch Barbarossa to its east and betray the Nazi-Soviet Pact in 1941.