Ukrainian Soviet Socialist Republic
Eventually, after the creation of the Communist Party (Bolshevik) of Ukraine in Moscow, a third Ukrainian Soviet government was formed on 21 December 1919 that initiated new hostilities against Ukrainian nationalists as they lost their military support from the defeated Central Powers. Eventually, the Red Army ended up controlling much of the Ukrainian territory after the Polish-Soviet Peace of Riga. On 30 December 1922, along with the Russian, Byelorussian, and Transcaucasian republics, the Ukrainian SSR was one of the founding members of the Union of Soviet Socialist Republics (USSR).
Ukrainian Soviet Socialist Republic
When Stalin died on 5 March 1953 the collective leadership of Khrushchev, Georgy Malenkov, Vyacheslav Molotov and Lavrentiy Beria took power and a period of de-Stalinisation began. Change came as early as 1953, when officials were allowed to criticise Stalin's policy of russification. The Central Committee of the Communist Party of Ukraine (CPU) openly criticised Stalin's russification policies in a meeting in June 1953. On 4 June 1953, Oleksii Kyrychenko succeeded Leonid Melnikov as First Secretary of the CPU; this was significant since Kyrychenko was the first ethnic Ukrainian to lead the CPU since the 1920s. The policy of de-Stalinisation took two main features, that of centralisation and decentralisation from the centre. In February 1954 the Russian Soviet Federative Socialist Republic (RSFSR) transferred Crimea as a gift to Ukraine from the Russians; even if only 22 percent of the Crimean population were ethnic Ukrainian. 1954 also witnessed the massive state-organised celebration of the 300th anniversary of the Treaty of Pereyaslav; the treaty which brought Ukraine under Russian rule three centuries before. The event was celebrated to prove the old and brotherly love between Ukrainians and Russians, and proof of the Soviet Union as a "family of nations"; it was also another way of legitimising Marxism–Leninism.