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.
Volhynia
Soviet Ukraine annexed Volhynia after the end of World War II. In 1944 the communists in Volyhnia suppressed the Ukrainian Catholic Apostolic Exarchate. Most of the remaining ethnic Polish population were expelled to Poland in 1945. Since the dissolution of the Soviet Union in the 1990s, Volhynia has been an integral part of Ukraine.