History of the Soviet Union (1964–82) Brezhnev remained wary of any sort of intervention and Kosygin reminded leaders of the consequences of the Soviet suppression of the 1956 Hungarian revolution. In the aftermath of the invasion the Brezhnev Doctrine was introduced; it stated that the Soviet Union had the right to intervene in any socialist country on the road to communism which was deviating from the communist norm of development. The doctrine was condemned by Romania, Albania and Yugoslavia. As a result, the worldwide communist movement became poly-centric, meaning that the Soviet Union lost its role as 'leader' of the world communist movement. In the aftermath
Communist Party of the Soviet Union been achieved in more advanced countries such as England and Germany. On 30 December 1922, the Russian SFSR joined former territories of the Russian Empire to form the Union of Soviet Socialist Republics, of which Lenin was elected leader. On 9 March 1923, Lenin suffered a stroke, which incapacitated him and effectively ended his role in government. He died on 21 January 1924, only thirteen months after the founding of the Soviet Union, of which he would become regarded as the founding father. After Lenin's death, a power struggle ensued between Joseph Stalin, the party's General Secretary, and Leon Trotsky,