Ukrainian Soviet Socialist Republic
The Ukrainian Soviet Socialist Republic (Ukrainian SSR or UkrSSR or UkSSR; , УРСР ; , УССР ; see "Name" section below), also known as the Soviet Ukraine, was one of the constituent republics of the Soviet Union from the Union's inception in 1922 to its breakup in 1991. The republic was governed by the Communist Party of Ukraine as a unitary one-party socialist soviet republic.
Western Ukraine
Following the defeat of Ukrainian People's Republic (1918) in the Ukrainian–Soviet War of 1921, Western Ukraine was partitioned by the Treaty of Riga between Poland, Czechoslovakia, Hungary, and the Soviet Russia acting on behalf of the Soviet Belarus and the Ukrainian Soviet Socialist Republic with capital in Kharkiv. The Soviet Union gained control over the entire territory of the short-lived Ukrainian People's Republic east of the border with Poland. In the Interbellum most of the territory of today's Western Ukraine belonged to the Second Polish Republic. Territories such as Bukovina and Carpatho-Ukraine belonged to Romania and Czechoslovakia, respectively.
At the onset of Operation Barbarossa by Nazi Germany, the region became part of the Third Reich in 1941. The southern half of West Ukraine was incorporated into the semi-colonial "Distrikt Galizien" (District of Galicia) created on August 1, 1941 (Document No. 1997-PS of July 17, 1941 by Adolf Hitler) with headquarters in Chełm Lubelski, bordering district of General Government to the west. Its northern part (Volhynia) was assigned to the "Reichskommissariat Ukraine" formed in September 1941. Notably, the District of Galicia was a separate administrative unit from the actual "Reichskommissariat Ukraine" with capital in Rivne. They were not connected with each other politically. Bukovina was controlled by the pro-Nazi Kingdom of Romania. After the defeat of Germany in World War II, in May 1945 the Soviet Union incorporated all territories of current Western Ukraine into the Ukrainian SSR.