Nuclear Issues

All the world's nuclear-armed states (except for North Korea) have begun modernizing and upgrading their arsenals, leading many observers to predict that the world is entering a new nuclear arms race. While that outcome is not yet inevitable, it is likely, and if it happens, the new nuclear arms race will be different and more dangerous than the one we remember. More nuclear-armed countries in total, and three competing great powers rather than two, will make the competition more complex. Meanwhile, new non-nuclear weapon technologies — such as ballistic missile defense, anti-satellite weapons, and precision-strike missile technology — will make nuclear deterrence relationships that were once somewhat stable less so.

"Ukraine's denuclearization had been a controversial issue even as it was negotiated, leaving bitter traces in the country's political and public discourse. As a student of political science in Kyiv in the mid-1990s, I remember being outraged by the sense of injustice: how could the states that rely on their own nuclear deterrents demand the nuclear disarmament of others? More so that one of these states, Russia, has never fully come to terms with Ukraine's independence. Since then, I came to research a doctoral dissertation on the denuclearization of post-Soviet successor states and, in the process, learned a great deal about Ukraine's nuclear disarmament that dispelled many of my preconceptions."

How does the acquisition of nuclear weapons affect states' foreign policy? A new typology of six potential post-acquisition state behaviors—aggression, expansion, independence, bolstering, steadfastness, and compromise—offers a more nuanced answer to this question than previous studies have provided. The United Kingdom's foreign policy after it developed the bomb reveals how nuclear weapons can make a country more assertive.

A prominent model of nuclear proliferation posits that a powerful patron state can prevent a weaker ally from proliferating by providing it with security guarantees. The history of West Germany's pursuit of the bomb from 1954 to 1969 suggests that a patron may also need to threaten the client state with military abandonment to convince it not to acquire nuclear weapons.

When do states acquire nuclear weapons? History shows that only two types of states decide that the bomb is essential to their security: 1) very powerful states; and 2) weak states that lack ironclad security guarantees.