Leaders of the United States, the United Kingdom, and the Soviet Union, known as the 'Big Three' - Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin respectively - convened at the Yalta Conference in February 1945. Key discussions focused on the post-World War II reorganization of Europe and the formation of the United Nations.
The Yalta Conference significantly influenced the post-war global structure, with the establishment of the United Nations being a primary achievement.