Who was the leader of the Soviet Union during World War II?

The leader of the Soviet Union during World War II was Joseph Stalin. He played a critical role in the conflict, particularly after the invasion of the Soviet Union by Nazi Germany in 1941. Stalin's leadership was marked by a strong centralization of power and a focus on industrial and military production, which contributed to the USSR's ability to withstand and eventually push back against the German forces. Under his command, the Red Army faced significant battles, including the pivotal Battle of Stalingrad, which marked a turning point in the war in favor of the Allies.

In the context of the other figures mentioned, Winston Churchill was the Prime Minister of the United Kingdom, Franklin D. Roosevelt was the President of the United States, and Adolf Hitler was the Chancellor of Germany. Each of these leaders had immense impact on their respective countries and the broader war efforts, but it was Stalin who directly led the Soviet Union during this critical period, coordinating military strategies and engaging in diplomacy with the Allies to ensure their collective victory over Axis powers.