After World War II Japan enacted its
postwar constitution which, in
Article 9, stated that "The Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as means of settling international disputes." Such antimilitarist constitution was based on the belief that Japan's military organizations were to blame for thrusting the country into World War II. In Yasuhiro Izumikawa's article "Explaining Japanese Antimilitarism: Normative and Realist Constraints on Japan's Security Policy", the evidences for the constructivist's belief in the existence of the single norm of antimilitarism in Post war Japan are introduced. These evidences include the
Yoshida Doctrine, adopted after the World War II, which emphasized the importance of Japan's economic development and acceptance of the U.S. security umbrella. Also, the institutional constraints imposed on Japan's security policy after World War II and Japan's
Three Non-Nuclear Principles which is about not possessing, producing, or permitting the introduction of nuclear weapons into Japan are mentioned as the evidence for antimilitarism. In contrast to the constructivist's view, in Izumikawa's article, the realists are said to believe that the postwar security policy in Japan is a combination of pacifism, antitraditionalism, and the fear of entrapment rather than just being based on the single norm of antimilitarism. However, the postwar constitution on which Japan's antimilitarism is based has seen some proposed amendments, and article 9 has been renounced by the
Liberal Democratic Party. Some
new legislation allows Japan's Self Defense Forces to act more like a conventional army, reinterpreting the constitutional restrictions. This legislation has been strongly opposed by Japanese opposition parties, especially the
Japanese Communist Party, which is strongly opposed to militarism. == Antimilitarist groups ==