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1992
Proposed by Ireland, the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) was opened for signature on July 1, 1968. China signed the NPT in 1992.
Literature:
Garrett, Banning N. / Glaser, Bonnie S. (1995): Chinese perspectives on nuclear arms control. In: International Security, Vol. 20, No. 3, 43-78 (Published by The MIT Press for the Belfer Center for Science and International Affairs, Harvard University)
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