When did atomic weapons appear in the USSR and who created them?

During the Great Patriotic War, Soviet intelligence reported on attempts by German scientists to develop atomic weapons. In this regard, the Soviet leadership in 1943 decided on the need to create a similar project. Academician I.V. Kurchatov. In August 1945, the US military dropped two atomic bombs on Japan. This fact forced the USSR to accelerate work towards the development of atomic weapons, including with the involvement of foreign specialists and technologies. On August 29, 1949, the first successful test of an atomic bomb by the Soviet Union was carried out near the city of Semipalatinsk. Since that date, the USSR has become a nuclear power.