Following World War II , at the insistence of Joseph Stalin during Tehran Conference confirmed ( as not negotiable ) at the Yalta Conference of 1945 , Poland 's borders were redrawn and Łuck – then again , Lutsk ( Cyrillic : Луцьк ) – was incorporated into the Ukrainian SSR of the Soviet Union . The remaining Polish population was expelled and resettled back to new Poland before the end of 1946 . The Jewish community was never restored . The USSR officially ceased to exist on 31 December 1991
Yalta Conference
Yalta Conference
Lutsk Ghetto