November 28, 1943Tehran Conference.
The Tehran Conference was the meeting of Joseph Stalin, Franklin D. Roosevelt and Winston Churchill between November 28 and December 1, 1943, most of which was held at the Soviet Embassy in Tehran, Iran. It was the first World War II conference amongst the Big Three (the Soviet Union, the United States, and the United Kingdom) in which Stalin was present. It almost immediately followed the Cairo Conference (November 22–26, 1943) and preceded both the Yalta Conference (February 4–11, 1945) and the Potsdam Conference (July 17 - August 2, 1945). The central aim of the Tehran conference was to plan the final strategy for the war against Nazi Germany and its allies, and the chief discussion was centered on the opening of a second front in Western Europe.