1972 – The U.S. and the Soviet Union joined with 70 other nations in signing an agreement banning biological warfare.


The Biological Weapons Convention (BWC), the first multilateral disarmament treaty banning the development, production and stockpiling of an entire category of weapons of mass destruction, was opened for signature on 10 April 1972. The BWC entered into force on 26 March 1975.
Biological Weapons – UNODA
https://www.un.org/disarmament/wmd/bio/

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