Sorge is most famous for his service in Japan in 1940 and 1941, when he provided information about Adolf Hitler's plan to attack the Soviet Union. Then, in mid-September 1941, he informed the Soviets that Japan would not attack the Soviet Union in the near future. A month later, Sorge was arrested in Japan for espionage. He was tortured, forced to confess, tried and hanged in November 1944. Stalin declined to intervene on his behalf with the Japanese.