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).
Elections to the People's Assemblies of Western Ukraine and Western Belorussia
On November 1, the Supreme Soviet approved annexation of Western Ukraine, and on the next day, of Western Belorussia. On November 14, the Supreme Soviet of Byelorussian Soviet Socialist Republic in Minsk officially annexed former territories of northeastern Poland, without the area of Wilno, which had been seized by Lithuania. On November 15, the Supreme Soviet of Ukrainian Soviet Socialist Republic in Kiev, annexed former southeastern Poland. On November 29, the Supreme Soviet issued a decree upon which all inhabitants of Poland living in Western Ukraine and Western Belorussia became citizens of the Soviet Union. This decision had a far-reaching consequences, because now, the NKVD apparatus had legal reasons to arrest members of prewar political parties of Poland, accusing them of anti-Soviet activity. Furthermore, the Supreme Soviet's decree resulted in massive draft into the Red Army. Polish historian Rafal Wnuk estimates that 210 000 inhabitants of former eastern Poland, born in 1917, 1918, and 1919, ended up in the Red Army. After official annexation of Western Ukraine and Western Belorussia, both Assemblies were dissolved.