Political map of Russia & the former Soviet Union 22 August 1939 (Soviet-Japanese Border Wars): The late 1930s saw international stability further deteriorate, with a Japanese invasion of China (Second Sino-Japanese War) followed by the German seizure of Austria (Anschluss) and Czechoslovakia (Munich Agreement). Japan's expansionism brought it into direct conflict with the Soviet Union. In July and August 1938, and again from May to September 1939, the Japanese were beaten back in undeclared border wars (Soviet-Japanese Border Wars) with Soviet and Mongolian troops.