Tehran Conference ( codenamed Eureka ) was a strategy meeting of Joseph Stalin , Franklin D. Roosevelt , and Winston Churchill from 28 November to 1 December 1943 , after the Anglo-Soviet Invasion of Iran . It was held in the Soviet Union 's embassy in Tehran , Iran . It was the first of the World War II conferences of the " Big Three " Allied leaders ( the Soviet Union , the United States , and the United Kingdom ) . It closely followed the Cairo Conference which had taken place on 22 – 26 November 1943 , and preceded the 1945 Yalta and Potsdam conferences . Although the three leaders arrived with differing objectives , the main outcome of the Tehran Conference was the Western Allies ' commitment to open a second front against Nazi Germany . The conference also addressed the ' Big Three ' Allies ' relations with Turkey and Iran , operations in Yugoslavia and against Japan , and the envisaged post-war settlement . A separate protocol signed at the conference pledged the Big Three to recognize Iran 's independence
Yalta
Yalta Conference
Tehran Conference