After the collapse of the Austro-Hungarian monarchy in 1918 and the proclamation of the First Austrian Republic, diplomatic relations with the Union of Soviet Socialist Republics were established on 25 February 1924. The first Soviet Plenipotentiary in Vienna was Jan Antonovich Berzin. Diplomatic relations were broken in March 1938 after the German invasion of Austria and its incorporation into Nazi Germany. After the Second World War, the USSR and Austria re-established diplomatic relations at the level of political representation, which in 1953 was converted into embassies. The preamble of the Austrian State Treaty, signed on 15 May 1955 by the USSR, United States, United Kingdom, France and Austria, established that the treaty formed the basis of Soviet relations with Austria. After the dissolution of the Soviet Union, relations continued between the Russian Federation and the Austrian state.