sentences:  One difference between the Germans and Croatians was that the Ustashe allowed its Jewish and Serbian victims to convert to Catholicism so they could escape death.According to Jozo Tomasevich of the 115 Jewish religious communities from Yugoslavia which exist in 1939 and 1940 only Jewish communities from Zagreb managed to survive the war.Germany invaded the Soviet Union on 22 June 1941, a day Timothy Snyder called "one of the most significant days in the history of Europe ... the beginning of a calamity that defies description".