Almost analysts consider that Manchurian incident was SINRYAKU (侵略=cruel aggression) of Japan which was caused by Kwantung Army's runaway. There have been few legal studies about Manchurian incident. Japan was blamed because he broke the Nine-Power Treaty, the Kellogg-Briand Pact, and the Convenant of the League. But Japan's act is not injustice in international law. Before Manchurian incident, the Republic of China could not rule Manchuria. The act of Kwantung army is naturally illicit. But eventually, it was evasion. We must analyze Manchurian incident not only by perspective of politics but also by perspective of international and domestic law.
