The Soviet authorities who occupied the Polesie Voivodeship dismantled the Polish administration and formally annexed what became known as West Belarus into the Soviet Union, dividing it between the Ukrainian Soviet Socialist Republic and the Byelorussian Soviet Socialist Republic (Polesia Voblast). Following the Tehran Conference of 1943, Joseph Stalin insisted in 1945 on redrawing Poland's borders with Western approval. The Soviets forcibly resettled the Polish population of the province to the west, and the prewar voivodeship area became part of the Soviet Union for the next sixty years. most of the former Polesie Voivodeship (including Brześć and Pińsk) belongs to the sovereign Belarus; only the southern part of it belongs to Ukraine (Kamień Koszyrski and Sarny). Nearly all of Belarusian part of Polesie Voivodeship is part of Brest Voblast, except Sosnkowicze (now Lenin) gmina of Łuniniec powiat with villages of Cimoszewicze ve Milewicze, it was part of Pinsk Oblast between 1939 and 1941 and 1944 and 1954 and Brest Voblast between 1954 and 1960 as a raion (Its center was moved to Mikashevichy in 8 June) before transferring to Žytkavičy Rajon of Homiel Voblast due to dissolving Lenin one on 20 January 1960.