 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).