The Moscow and Tehran Conferences

The Moscow Declaration on General Security

On October 30, 1943, the foreign ministers of the United States, the United Kingdom, the U.S.S.R. and the Chinese Ambassador to Moscow issued the Declaration of Four Nations on General Security, which contemplated the establishment at the earliest practicable date of a general international organization.
In the following month between November 28 and December 1, 1943, President Roosevelt, Prime Minister Churchill, and Soviet Premier Stalin held a meeting in Tehran, Iran. It was during this Conference that the three leaders coordinated their military strategy against Germany. The most notable achievement of the Conference was the focus on the next phases of the war against the Axis powers in Europe and Asia.

Moscow and Teheran Conferences http://www.un.org/en/aboutun/history/moscowteheran.shtml

Thus by 1943 all the principal Allied nations were committed to outright victory and, thereafter, to an attempt to create a world in which “men in all lands may live out their lives in freedom from fear and want.” But the basis for a world organization had yet to be defined, and such a definition came at the meeting of the Foreign Ministers of Great Britain, the United States and the Soviet Union in October 1943. The United States Secretary of State, the venerable Cordell Hull, made the first flight of his life to journey to Moscow for the conference. On October 30, the Moscow Declaration was signed by Vyaches Molotov, Anthony Eden, Cordell Hull and Foo Ping Shen, the Chinese Ambassador to the Soviet Union.