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.
Eastern Bloc politics
In 1922, the Russian Soviet Federative Socialist Republic (RSFSR), the Ukrainian SSR, the Byelorussian SSR and the Transcaucasian SFSR, approved the Treaty of Creation of the USSR and the Declaration of the Creation of the USSR, forming the Soviet Union. At the end of World War II by mid-1945, all eastern and central European capitals were controlled by the Soviet Union. During the final stages of the war, the Soviet Union began the creation of the Eastern Bloc by directly annexing several countries as Soviet Socialist Republics that were originally effectively ceded to it by Nazi Germany in the Molotov–Ribbentrop Pact. Eastern Poland, eastern Finland, the Baltics, Bukovina, and Bessarabia, now called Moldova, were forcibly incorporated into the Soviet Union. The eastern Polish territories remain part of Ukraine and Belarus as of the early 21st century.