Japan's non-nuclear weapons policy is a policy popularly articulated as the Three Non-Nuclear Principles of non-possession, non-production, and non-introduction of nuclear weapons imposed by Douglas MacArthur during the Allied occupation of Japan following the Second World War. Developmental history Following World War II, the atomic bombings, at Hiroshima and Nagasaki and the deconstruction of their imperial military, Japan came under the US "nuclear umbrella" on the condition that they would not produce nuclear weapons. The requirement was imposed by the United States that Japan might develop nuclear weapons, as the technology to develop a nuclear device became known around the world. This was formalized in the Security Treaty Between the United States and Japan, a corollary to the Treaty of Peace with Japan, which authorized the U.S. to deploy military forces in Japan in order "to contribute to the maintenance of the international peace and security in the Far East and to the security of Japan against armed attack from without". The treaty was first invoked in 1953 when, following a series of Japanese airspace violations by Soviet MiG-15s, the Japanese Foreign Ministry requested U.S. intervention. Early public opposition In the years after the occupation, with the atomic bombings of Hiroshima and Nagasaki still fresh in the Japanese consciousness, public sentiment was strongly against the use, and even presence on Japanese soil, of nuclear weapons. This sentiment was evidenced by the widely reported accidental irradiation of the Daigo Fukuryu Maru from a U.S. hydrogen bomb test in 1954. News of the incident aroused public fears over radiation and outcry against atomic and nuclear weapons testing. On 28 July 1955, the U.S. announced its intention to equip military bases in Japan with Honest Johns, conventional missiles which could also be fitted with atomic warheads. The Eisenhower Administration and Hatoyama Cabinet had been arranging for the deployment since March, but the announcement sparked outrage in the Diet and public protest. Okazaki and Hatoyama were forced to make assurances to the Diet that the missiles would not be equipped with nuclear warheads on Japanese territory, and that the United States would have to consult with the entire government before introducing nuclear weapons into Japan. The language of the Atomic Energy Basic Law, adopted in December 1955, reflects the public sentiment, restricting "the research, development and utilization of atomic energy" to "peaceful purposes". Nuclear power is used in Japan. In 1957, Prime Minister Nobusuke