Gromyko was a Soviet delegate to the Tehran, Dumbarton Oaks, Yalta and Potsdam conferences. In 1943, the same year as the Tehran Conference, the USSR established diplomatic relations with Cuba and Gromyko was appointed the Soviet ambassador to Havana. Gromyko claimed that the accusations brought against Roosevelt by American right-wingers, that he was a socialist sympathizer, were absurd. While he started out as a member delegate Gromyko later became the head of the Soviet delegation to the San Francisco conference after Molotov's departure. When he later returned to Moscow to celebrate the Soviet victory in the Great Patriotic War, Stalin commended him saying a good diplomat was "worth two or three armies at the front".