 That same night, the Mukden Incident occurred, which provided the pretext for the Japanese invasion of Manchuria.From Tatekawa's peculiar behavior the previous night, it can be surmised that he was aware of, and supported, the plot and had taken the deliberate decision not to prevent it .In December 1931, Tatekawa was on the Japanese delegation to the Geneva Disarmament Conference and from July 1932 was the Japanese permanent representative to the League of Nations in Geneva until Japan officially withdrew from the League in March 1933.