In September 1939, under the Molotov-Ribbentrop Treaty, the Soviet Union attacked Poland and re-merged the lands of the eastern part of the country, including most of Poland’s controlled Belorussian territory.  In 1941, Nazi Germany invaded the Soviet Union. Letterkenny To be fairrrrr mug. Belussia was captured shortly thereafter and remained in German hands until 1944. More than one million houses were destroyed and more than two million Belarusian died.  Jews in Belorussia were massacred in the Holocaust. The population of Belarus only reached pre-war levels in 1971. However, the number of Jews never recovered. After the war ended, Belorussia was one of the five countries that signed the UN Charter in 1945. After the war, Belarus began a reconstruction program, with the help of Moscow.