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.

IMBALANCE OF TERROR

Even as the United States' nuclear forces have grown stronger since the end of the Cold War, Russia's strategic nuclear arsenal has sharply deteriorated. Russia has 39 percent fewer long-range bombers, 58 percent fewer ICBMs, and 80 percent fewer SSBNs than the Soviet Union fielded during its last days. The true extent of the Russian arsenal's decay, however, is much greater than these cuts suggest. What nuclear forces Russia retains are hardly ready for use. Russia's strategic bombers, now located at only two bases and thus vulnerable to a surprise attack, rarely conduct training exercises, and their warheads are stored off-base. Over 80 percent of Russia's silo-based ICBMs have exceeded their original service lives, and plans to replace them with new missiles have been stymied by failed tests and low rates of production. Russia's mobile ICBMs rarely patrol, and although they could fire their missiles from inside their bases if given sufficient warning of an attack, it appears unlikely that they would have the time to do so.

The third leg of Russia's nuclear triad has weakened the most. Since 2000, Russia's SSBNs have conducted approximately two patrols per year, down from 60 in 1990. (By contrast, the U.S. SSBN patrol rate today is about 40 per year.) Most of the time, all nine of Russia's ballistic missile submarines are sitting in port, where they make easy targets. Moreover, submarines require well-trained crews to be effective. Operating a ballistic missile submarine -- and silently coordinating its operations with surface ships and attack submarines to evade an enemy's forces -- is not simple. Without frequent patrols, the skills of Russian submariners, like the submarines themselves, are decaying. Revealingly, a 2004 test (attended by President Vladimir Putin) of several submarine-launched ballistic missiles was a total fiasco: all either failed to launch or veered off course. The fact that there were similar failures in the summer and fall of 2005 completes this unflattering picture of Russia's nuclear forces.

Compounding these problems, Russia's early warning system is a mess. Neither Soviet nor Russian satellites have ever been capable of reliably detecting missiles launched from U.S. submarines. (In a recent public statement, a top Russian general described his country's early warning satellite constellation as "hopelessly outdated.") Russian commanders instead rely on ground-based radar systems to detect incoming warheads from submarine-launched missiles. But the radar network has a gaping hole in its coverage that lies to the east of the country, toward the Pacific Ocean. If U.S. submarines were to fire missiles from areas in the Pacific, Russian leaders probably would not know of the attack until the warheads detonated. Russia's radar coverage of some areas in the North Atlantic is also spotty, providing only a few minutes of warning before the impact of submarine-launched warheads.

Moscow could try to reduce its vulnerability by finding the money to keep its submarines and mobile missiles dispersed. But that would be only a short-term fix. Russia has already extended the service life of its aging mobile ICBMs, something that it cannot do indefinitely, and its efforts to deploy new strategic weapons continue to flounder. The Russian navy's plan to launch a new class of ballistic missile submarines has fallen far behind schedule. It is now highly likely that not a single new submarine will be operational before 2008, and it is likely that none will be deployed until later.

Even as Russia's nuclear forces deteriorate, the United States is improving its ability to track submarines and mobile missiles, further eroding Russian military leaders' confidence in Russia's nuclear deterrent. (As early as 1998, these leaders publicly expressed doubts about the ability of Russia's ballistic missile submarines to evade U.S. detection.) Moreover, Moscow has announced plans to reduce its land-based ICBM force by another 35 percent by 2010; outside experts predict that the actual cuts will slice 50 to 75 percent off the current force, possibly leaving Russia with as few as 150 ICBMs by the end of the decade, down from its 1990 level of almost 1,300 missiles. The more Russia's nuclear arsenal shrinks, the easier it will become for the United States to carry out a first strike.

To determine how much the nuclear balance has changed since the Cold War, we ran a computer model of a hypothetical U.S. attack on Russia's nuclear arsenal using the standard unclassified formulas that defense analysts have used for decades. We assigned U.S. nuclear warheads to Russian targets on the basis of two criteria: the most accurate weapons were aimed at the hardest targets, and the fastest-arriving weapons at the Russian forces that can react most quickly. Because Russia is essentially blind to a submarine attack from the Pacific and would have great difficulty detecting the approach of low-flying stealthy nuclear-armed cruise missiles, we targeted each Russian weapon system with at least one submarine-based warhead or cruise missile. An attack organized in this manner would give Russian leaders virtually no warning.

This simple plan is presumably less effective than Washington's actual strategy, which the U.S. government has spent decades perfecting. The real U.S. war plan may call for first targeting Russia's command and control, sabotaging Russia's radar stations, or taking other preemptive measures -- all of which would make the actual U.S. force far more lethal than our model assumes.

According to our model, such a simplified surprise attack would have a good chance of destroying every Russian bomber base, submarine, and ICBM. [See Footnote #1] This finding is not based on best-case assumptions or an unrealistic scenario in which U.S. missiles perform perfectly and the warheads hit their targets without fail. Rather, we used standard assumptions to estimate the likely inaccuracy and unreliability of U.S. weapons systems. Moreover, our model indicates that all of Russia's strategic nuclear arsenal would still be destroyed even if U.S. weapons were 20 percent less accurate than we assumed, or if U.S. weapons were only 70 percent reliable, or if Russian ICBM silos were 50 percent "harder" (more reinforced, and hence more resistant to attack) than we expected. (Of course, the unclassified estimates we used may understate the capabilities of U.S. forces, making an attack even more likely to succeed.)

To be clear, this does not mean that a first strike by the United States would be guaranteed to work in reality; such an attack would entail many uncertainties. Nor, of course, does it mean that such a first strike is likely. But what our analysis suggests is profound: Russia's leaders can no longer count on a survivable nuclear deterrent. And unless they reverse course rapidly, Russia's vulnerability will only increase over time.