It was agreed at the Potsdam Conference ( 17 July – 2 August 1945 ) immediately after World War II to establish the Council of Foreign Ministers of the United States , Great Britain and the USSR to make peace treaties with the countries that had opposed Germany . This group first met in London in 1945 , where disputes over the US occupation of Japan prevented much being achieved . The council met again in Moscow later in 1945 and agreed to prepare draft treaties with Italy , Hungary , Romania , Bulgaria , and Finland
Potsdam Conference
Potsdam Conference
Big Four Conference