The Rise of U.S. Nuclear Primacy

Keir A. Lieber and Daryl G. Press

From Foreign Affairs, March/April 2006

Summary:  For four decades, relations among the major nuclear powers have been shaped by their common vulnerability, a condition known as mutual assured destruction. But with the U.S. arsenal growing rapidly while Russia's decays and China's stays small, the era of MAD is ending -- and the era of U.S. nuclear primacy has begun.

Keir A. Lieber, the author of War and the Engineers: The Primacy of Politics Over Technology, is Assistant Professor of Political Science at the University of Notre Dame. Daryl G. Press, the author of Calculating Credibility: How Leaders Assess Military Threats, is Associate Professor of Political Science at the University of Pennsylvania.

The intentional pursuit of nuclear primacy is, moreover, entirely consistent with the United States' declared policy of expanding its global dominance. The Bush administration's 2002 National Security Strategy explicitly states that the United States aims to establish military primacy: "Our forces will be strong enough to dissuade potential adversaries from pursuing a military build-up in hopes of surpassing, or equaling, the power of the United States." To this end, the United States is openly seeking primacy in every dimension of modern military technology, both in its conventional arsenal and in its nuclear forces.

Washington's pursuit of nuclear primacy helps explain its missile-defense strategy, for example. Critics of missile defense argue that a national missile shield, such as the prototype the United States has deployed in Alaska and California, would be easily overwhelmed by a cloud of warheads and decoys launched by Russia or China. They are right: even a multilayered system with land-, air-, sea-, and space-based elements, is highly unlikely to protect the United States from a major nuclear attack. But they are wrong to conclude that such a missile-defense system is therefore worthless -- as are the supporters of missile defense who argue that, for similar reasons, such a system could be of concern only to rogue states and terrorists and not to other major nuclear powers.

What both of these camps overlook is that the sort of missile defenses that the United States might plausibly deploy would be valuable primarily in an offensive context, not a defensive one -- as an adjunct to a U.S. first-strike capability, not as a standalone shield. If the United States launched a nuclear attack against Russia (or China), the targeted country would be left with a tiny surviving arsenal -- if any at all. At that point, even a relatively modest or inefficient missile-defense system might well be enough to protect against any retaliatory strikes, because the devastated enemy would have so few warheads and decoys left.

During the Cold War, Washington relied on its nuclear arsenal not only to deter nuclear strikes by its enemies but also to deter the Warsaw Pact from exploiting its conventional military superiority to attack Western Europe. It was primarily this latter mission that made Washington rule out promises of "no first use" of nuclear weapons. Now that such a mission is obsolete and the United States is beginning to regain nuclear primacy, however, Washington's continued refusal to eschew a first strike and the country's development of a limited missile-defense capability take on a new, and possibly more menacing, look. The most logical conclusions to make are that a nuclear-war-fighting capability remains a key component of the United States' military doctrine and that nuclear primacy remains a goal of the United States.

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During the Cold War, MAD rendered the debate about the wisdom of nuclear primacy little more than a theoretical exercise. Now that MAD and the awkward equilibrium it maintained are about to be upset, the argument has become deadly serious. Hawks will undoubtedly see the advent of U.S. nuclear primacy as a positive development. For them, MAD was regrettable because it left the United States vulnerable to nuclear attack. With the passing of MAD, they argue, Washington will have what strategists refer to as "escalation dominance" -- the ability to win a war at any level of violence -- and will thus be better positioned to check the ambitions of dangerous states such as China, North Korea, and Iran. Doves, on the other hand, are fearful of a world in which the United States feels free to threaten -- and perhaps even use -- force in pursuit of its foreign policy goals. In their view, nuclear weapons can produce peace and stability only when all nuclear powers are equally vulnerable. Owls worry that nuclear primacy will cause destabilizing reactions on the part of other governments regardless of the United States' intentions. They assume that Russia and China will work furiously to reduce their vulnerability by building more missiles, submarines, and bombers; putting more warheads on each weapon; keeping their nuclear forces on higher peacetime levels of alert; and adopting hair-trigger retaliatory policies. If Russia and China take these steps, owls argue, the risk of accidental, unauthorized, or even intentional nuclear war -- especially during moments of crisis -- may climb to levels not seen for decades.

Ultimately, the wisdom of pursuing nuclear primacy must be evaluated in the context of the United States' foreign policy goals. The United States is now seeking to maintain its global preeminence, which the Bush administration defines as the ability to stave off the emergence of a peer competitor and prevent weaker countries from being able to challenge the United States in critical regions such as the Persian Gulf. If Washington continues to believe such preeminence is necessary for its security, then the benefits of nuclear primacy might exceed the risks. But if the United States adopts a more restrained foreign policy -- for example, one premised on greater skepticism of the wisdom of forcibly exporting democracy, launching military strikes to prevent the proliferation of weapons of mass destruction, and aggressively checking rising challengers -- then the benefits of nuclear primacy will be trumped by the dangers.

[Footnote #1] We develop our argument further in "The End of MAD? The Nuclear Dimension of U.S. Primacy," International Security 30, no. 4 (Spring 2006).