 Complete the following phrase:  After the Battles of Khalkhin Gol ended the JapaneseSoviet Border War in 1939 and before the USSR declared war on Japan Manchurian Strategic Offensive Operation on August 8, 1945, there was practically no hostile activity between the USSR and the Empire of Japan. Japan was a main ally of Adolf Hitler and Nazi Germanywhich the USSR initially had an understanding with, but found itself at war with from 