Recent scholarship on nuclear proliferation finds that many forms of nuclear assistance increase the odds that recipient states pursue nuclear weapons programs. While these studies may help us understand select cases of proliferation, they overshadow the role of nuclear supply in bolstering global nonproliferation efforts. After the risks of nuclear assistance became well-known following India’s nuclear explosion in 1974, most major suppliers conditioned their assistance on recipients joining nonproliferation agreements. Case studies of states’ decision-making regarding these agreements illustrate how the provision of nuclear technology has been an effective tool in persuading states to join such agreements, the most important of which is the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). By joining the NPT, states strengthen the global nonproliferation regime and increase the costs of any potential future decision to proliferate. The offer of nuclear assistance has done far more to bolster global nuclear nonproliferation efforts than recent research suggests.

The ACDA’s existence meant arms control and disarmament would not become lost in bureaucratic fights between other departments.

The Nuclear Nonproliferation Treaty (NPT), a bedrock of international security, had the 50-year anniversary of its signing in 2018. While the existence of the treaty has not been able to prevent a handful of states from seeking nuclear weapons, for half a century the NPT has promoted norms of nuclear nonproliferation and disarmament. Only nine states possess nuclear weapons today, far below the number predicted early in the nuclear age. Nonetheless, a second nuclear treaty, adopted in 2017, represents a significant and growing crack in the foundation of the NPT and suggests that relations among its members need to change if the treaty is going to survive another 50 years.

Foreign policy pundits have bemoaned the unraveling of the post-World War II international order in recent years, describing threats to the multilateralism and liberalism enshrined in postwar institutions. An often overlooked component of that structure is the global nuclear order, which, like other parts of the postwar system, was created for magnanimous and selfish aims: reducing the dangers of nuclear weapons for all and serving the interests of the world’s most powerful states.