An examination of the past relationships between nuclear proliferation and American security policy substantiates several propositions. First, the political relationship between the United States and each new nuclear weapon state was not fundamentally transformed as a result of nuclear proliferation. Second, with the exception of the Soviet Union, no new nuclear state significantly affected U.S. defense programs or policies. Third, American interest in bilateral nuclear arms control negotiations has been confined to the Soviet Union. Fourth, a conventional conflict involving a nonnuclear ally prompted the United States to intervene in ways it otherwise might not have in order to forestall the use of nuclear weapons.In all respects, however, the relationship between nuclear proliferation and American security policy is changing. The intensification of the superpower rivalry and specific developments in their nuclear weapons and doctrines, the decline of American power more generally, and the characteristics of nuclear threshold states all serve to stimulate nuclear proliferation. It will be increasingly difficult in the future for American security policy to be as insulated from this process as it has been in the past.
Implementation of the Treaty on the Prohibition of Nuclear Weapons: Hopes and Expectations for the Future