The Korean Armistice Agreement of 1953 brought the hostilities to a close with a cease fire. The U.S. broke the agreement in 1956:

“Paragraph 13(d) of the Armistice Agreement mandated that neither side introduce new weapons into Korea, other than piece-for-piece replacement of equipment. In September 1956 the U.S. Chairman of the Joint Chiefs of Staff Admiral Radford indicated that the U.S. military intention was to introduce atomic weapons into Korea, which was agreed to by the U.S. National Security Council and President Eisenhower.[34] However paragraph 13(d) prevented the introduction of nuclear weapons and missiles.[35] The U.S. unilaterally abrogated paragraph 13(d), breaking the Armistice Agreement, despite concerns by United Nations allies.[36][37][38] At a meeting of the Military Armistice Commission on June 21, 1957, the U.S. informed the North Korean representatives that the United Nations Command no longer considered itself bound by paragraph 13(d) of the armistice.[39][40] In January 1958 nuclear armed Honest John missiles and 280mm atomic cannons were deployed to South Korea,[41] a year later adding nuclear armed Matador cruise missiles with the range to reach China and the Soviet Union.[37][42]”

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