 Complete the following phrase:  The Red Army reached Słonim in mid-July 1944 during Operation Bagration. After World War II ended, Polands borders were redrawn, according to the demands made by Josef Stalin during Tehran Conference confirmed as not negotiable at the Yalta Conference of 1945. Słonim Cyrillic: Слоним was then incorporated into the Byelorussian SSR of the Soviet Union. The Polish population was 