premise: Ukrainian Soviet Socialist Republic was in the UN.
hypothesis: The Ukrainian Soviet Socialist Republic ( Ukrainian SSR or UkrSSR or UkSSR ; Украї́нська Радя́нська Соціалісти́чна Респу́бліка , Украї́нська РСР Украи́нская Сове́тская Социалисти́ческая Респу́блика , Украи́нская ССР see `` Name '' section below ) , commonly referred to in English as Ukraine ( [ juːˈkreɪn ] Україна , tr . Ukrayina [ ukrɑˈjinɑ ] ) , was one of the constituent republics of the Soviet Union from its inception in 1922 to its breakup in 1991 .