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Deterrence theory

Ch. 1 of 8
— CH. 1 · INTRODUCTION —

Contents

Deterrence theory

8 sections
  • Deterrence theory begins with an uncomfortable admission. Robert McNamara, who managed the Cuban Missile Crisis as US Secretary of Defense, later said that "it was luck that prevented nuclear war." Dean Acheson called the same crisis's peaceful resolution "plain dumb luck." General George Lee Butler, who commanded the US Strategic Air Command from 1991 to 1992, delivered his own verdict in 1999. He said humanity had escaped the Cold War without nuclear holocaust "by some combination of skill, luck, and divine intervention." He suspected divine intervention had played the largest part. None of these men were opponents of deterrence. They were the practitioners who built and ran it.

  • Thomas Schelling, writing in Arms and Influence in 1966, defined deterrence as "to prevent from action by fear of consequences." Glenn Snyder extended that definition by arguing that deterrence involves both the threat of sanction and the promise of reward. Both agree on the essential mechanism: a threat deters when the target believes the costs of acting outweigh the potential gains.

    Huth's framework identifies two broad forms of deterrence. Direct deterrence protects a state's own territory, typically arising between neighboring states without major-power involvement. Extended deterrence protects a third party, usually an ally, and has attracted the most scholarly attention. These forms divide further: general deterrence discourages conflict from arising at all, while immediate deterrence addresses a specific threat already forming.

    Rational deterrence theory compresses the entire problem into a single formula. If the costs an attacker would face, multiplied by the probability those costs are actually imposed, exceed the expected benefits, deterrence holds. The two main strategies for producing this outcome are denial and punishment. Denial blocks the attacker from achieving its goal. Punishment makes the attempt too costly to be worthwhile.

    Compellence differs from deterrence in a fundamental way. Where deterrence asks an adversary to refrain from an action, compellence demands it take one. Scholars have found compellence harder to achieve than deterrence. A successful deterrence policy must also account for diplomacy and politics, not only military capability. A state that avoids armed conflict only by conceding to an adversary's maximum demands cannot claim to have succeeded.

    World War II offered one of deterrence theory's earliest informal tests, before the concept had been given its modern name.

  • Nazi Germany deployed chemical weapons at the Siege of Sevastopol, the Siege of Odessa, and the Battle of the Kerch Peninsula against Soviet forces. Imperial Japan used them frequently against Chinese troops. Yet neither the Western Allies nor the Axis launched large-scale chemical strikes against each other in the way World War I combatants had.

    At the Nuremberg trials, Hermann Göring offered a specific explanation for German restraint in the West. He stated that initiating a chemical weapons exchange during Operation Overlord would have immobilized the Wehrmacht, which depended heavily on horse-drawn transport. No adequate gas mask had been designed for horses. The force that might have deployed chemical weapons would have been more vulnerable to them than its opponent.

    Fredrik Logevall and Kenneth Osgood wrote that Munich and appeasement had become "among the dirtiest words in American politics, synonymous with naivete and weakness." That lesson fed directly into postwar deterrence thinking. Any president who negotiated with a hostile power risked being accused of weakness, Logevall and Osgood argued. The success of US foreign policy often depended on a president withstanding those charges.

    The superpowers' nuclear arms race would soon take the calculations behind chemical and conventional deterrence into an entirely new order of destructive magnitude.

  • In November 1945, General Curtis LeMay addressed the Ohio Society of New York. His argument was direct: no air attack, once launched, can be completely stopped. The United States therefore needed a force capable of immediate retaliation. "If we are prepared," he said, "it may never come."

    The USSR and the United States then engaged in a nuclear arms race in pursuit of that deterrence logic. Warheads evolved from fission devices to thermonuclear weapons and were extensively miniaturized for both strategic and tactical use. The perceived bomber gap and missile gap each drove procurement decisions and strategic anxiety in turn. NATO was founded in 1949 with the deterrence of aggression as one of its explicit goals.

    Deterrence was a primary factor in nuclear weapons eventually spreading to ten nations in total. In most cases, the driver was the threat posed by a recently nuclear-armed neighboring state. Israel and South Africa were exceptions: both sought nuclear capability to deter conventional military attacks, not nuclear retaliation. Chemical weapons also formed part of Cold War deterrence on both sides. Large stockpiles were maintained until their destruction began following the Chemical Weapons Convention of 1993. President Richard Nixon ended the US offensive biological weapons program in 1969.

    Kenneth Waltz identified three requirements for successful nuclear deterrence. Part of a state's arsenal must appear able to survive an enemy first strike and be usable for retaliation. The state must not fire in response to false alarms. Command and control must remain intact. The United States, Russia, China, and India have all built nuclear triads: land-based, sea-based, and air-based weapons. Britain and France maintain only sea-based and air-based weapons.

    Bernard Brodie wrote in 1959 that a credible nuclear deterrent must always be ready.

  • Michael Kinsley, a Washington Post op-ed columnist and former student of Thomas Schelling, summarized his teacher's contribution with a single parable. Imagine standing at the edge of a cliff, your ankle chained to an adversary's. A large prize goes to whoever holds out longest. The only weapon at your disposal is the threat of pushing your opponent off, which would kill you both. Schelling's answer: begin dancing, inching ever closer to the drop. You need not convince your adversary you would choose mutual destruction. You need only show you are willing to accept a higher probability of accidentally falling than they are.

    Schelling argued that military strategy could no longer be defined as the science of military victory alone. It had become equally, if not more, the art of coercion, intimidation, and deterrence. The capacity to harm another state, he wrote, is most useful as a motivating factor held in reserve. Coercion requires that violence be anticipated and avoidable: the threat only works when the adversary has a way to back down.

    Schelling received the Nobel Memorial Prize for Economics for this body of work. Rational deterrence theorists built on his foundation by arguing that credibility requires costly signals. These are actions that raise the risk of conflict and increase the cost of backing down. States that are bluffing will not cross such a threshold, because it commits them to a conflict they are trying to avoid.

    Schelling's logic also produced a concept called the stability-instability paradox. When two states both possess nuclear weapons, the probability of direct war between them falls sharply. But the same logic makes limited or indirect conflicts more likely. Both sides know they can engage in proxy warfare without triggering the catastrophe each seeks to avoid. During the Cold War, the United States and the Soviet Union never fought each other directly. They clashed through proxies in Korea, Vietnam, Angola, the Middle East, Nicaragua, and Afghanistan.

    The doctrine of massive retaliation, threatening US nuclear strikes in response to Soviet conventional attacks, was the most direct policy translation of this framework.

  • George F. Kennan, regarded as the founding architect of containment policy, outlined his views in the Long Telegram. He later argued that his ideas had been misinterpreted: he had advocated economic support for weaker states, not military intervention. The Korean War became one of the most notable proxy conflicts of the containment era. US strategy extended across proxy conflicts in Africa, Asia, Central America, and South America.

    With the US withdrawal from Vietnam, the normalization of relations with China, and the Sino-Soviet Split, a new policy of détente took hold. Scholars have argued the most important factor was the rough nuclear parity both superpowers had achieved, making mutual assured destruction a clear reality. The period of détente lasted from the late 1960s until the start of the 1980s. The doctrine of mutual nuclear deterrence then characterized US-Soviet relations. That held until the onset of what came to be called the New Cold War in the early 2010s.

    President Ronald Reagan's arms buildup in the 1980s marked a third shift. Reagan cited growing Soviet influence in Latin America and the post-1979 revolutionary government of Iran as justifications. The US funded proxy conflicts: support for Saddam Hussein of Iraq during the Iran-Iraq War, and support for the mujahideen fighting Soviet forces in Afghanistan. Funding for the Contras in Nicaragua led to the Iran-Contra Affair. The International Court of Justice ruled against the United States in the case Nicaragua v. United States.

    The clearest expression of deterrence's ultimate logic came in the 1985 agreement between Ronald Reagan and Mikhail Gorbachev. They stated that "a nuclear war cannot be won and must never be fought." They emphasized preventing any conflict between them, "whether nuclear or conventional," and committed to not seeking military superiority.

    After the Soviet breakup, US deterrence policy was reformulated in the 1995 document called "Essentials of Post-Cold War Deterrence." It distinguished between the traditional approach toward Russia and a more aggressive posture toward states with smaller or potential nuclear capabilities. The tensions with Iran and North Korea over their nuclear programs reflect the continuing reach of that policy.

    By the early 2000s, scholars and policymakers were extending deterrence thinking into cyberspace, a domain the Cold War architects had not anticipated.

  • The Stuxnet attack on Iran's nuclear program became the most prominent cyber operation in this context, demonstrating that digital tools could physically damage critical infrastructure. By 2019, the only publicly acknowledged case of a cyberattack causing a power outage was the 2015 hack of Ukraine's power grid. These events prompted intense debate about how cyber capabilities alter traditional deterrence calculations.

    Lennart Maschmeyer identified a fundamental constraint he called a trilemma: in cyber operations, speed, intensity, and control are negatively correlated. A gain in one tends to produce losses in the other two. That constraint limits the coercive power of digital weapons. Political scientists Joseph Brown and Tanisha Fazal observed that states frequently neither confirm nor deny responsibility for cyber operations. By staying ambiguous, a state can avoid the escalatory risks of public credit while still signaling that it has cyber capabilities and resolve.

    Dan Altman cited the Western deployment of forces to Berlin in 1948-1949 as a successful tripwire deterrent. A tripwire works by placing a small force abroad whose destruction would trigger a much larger response. Dan Reiter and Paul Poast disputed this, arguing tripwires do not actually deter aggression. A 2022 study by Brian Blankenship and Erik Lin-Greenberg found tripwires no more reassuring to allies than forces stationed offshore.

    By 2022, the Russian invasion of Ukraine had produced what former US national security advisor John Bolton called a one-sided deterrence success. Russia had convinced the West that NATO military involvement in Ukraine would bring catastrophic consequences. The United States and its allies had failed to deter the invasion itself. Philip Breedlove, former Supreme Allied Commander Europe, said Western nuclear fears had left NATO "fully deterred," while Russia remained "completely undeterred."

    When Elon Musk denied Ukraine access to Starlink communications in Crimea, he blocked a planned drone attack on Russia's Black Sea fleet. Anne Applebaum argued that Musk himself had been deterred: Russia's ambassador had warned him that an attack on Crimea would bring a nuclear response. Ukraine later struck the same fleet using a different communications system. Caitlin Talmadge described intrawar deterrence as central to how conflicts get worse after they have already begun.

    Matthew Fuhrmann described how civilian nuclear technology can function as a deterrent in its own right, a concept he calls latent nuclear deterrence. A state that could rapidly build a nuclear weapon can deter adversaries who do not want to see it acquire one. That deterrence through ambiguity continues to shape international negotiations over nuclear programs today.

  • Frank C. Zagare has argued that deterrence theory is "logically inconsistent and empirically inaccurate." His alternative, called perfect deterrence theory, allows for the fact that states vary in their internal characteristics and in the credibility of their threats. A related line of criticism points to the frequency of deterrence failures. Those failures may be attributed not to pure irrationality but to the misperceptions decision-makers hold about costs and benefits.

    "Lucky" nuclear close calls, in the terminology adopted by researchers, include cases where disaster was avoided independently of control systems. Others were avoided despite those systems, or because of their failure. Those three categories share a common thread: the outcome was not within the full control of the leaders managing the crisis. The lack of purposeful or accidental nuclear war can be attributed, in different instances, to technical failures, disobedience, or factors beyond strict human management.

    Sam Nunn, William Perry, Henry Kissinger, and George Shultz called on governments to pursue a world free of nuclear weapons. They created the Nuclear Security Project to advance that agenda. In 2010, all four appeared in a documentary called Nuclear Tipping Point. Kissinger argued that classical deterrence assumed aggressors would recoil from consequences: "In a world of suicide bombers, that calculation doesn't operate in any comparable way." Shultz said that people capable of suicide attacks are "almost by definition not deterrable."

    China, India, Pakistan, Britain, and France all practice minimum deterrence. The concept holds that a state should maintain no more nuclear weapons than necessary to deter attack. Pursuing reductions during US-Russian arms negotiations allows progress without immediate vulnerability. Beyond a certain point, however, further reductions may incentivize an adversary to secretly expand its arsenal.

    Paul Nitze argued in 1994 that nuclear weapons had become obsolete in what he called the "new world disorder" following the Soviet dissolution. He advocated relying instead on precision guided munitions to maintain a permanent military advantage. Robert L. Holmes raised a different objection, grounded in ethics. Holmes argued that deterrence theory requires holding a permanent threat of killing innocent people in reserve. He described such theories as prima facie immoral. He also argued it was irrational to rely on the continuous development of weapons precisely in order to prevent their use.

    In Libya, Iraq, and North Korea, the demand for regime change pushed adversaries' compliance costs beyond what any deterrent threat could overcome.

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Common questions

What is deterrence theory in international relations?

Deterrence theory is the study of how threats of force can convince an adversary to refrain from taking an action. A state deters when the target believes the expected costs of acting, multiplied by the probability those costs are imposed, exceed the expected benefits. The theory distinguishes between direct deterrence, which protects a state's own territory, and extended deterrence, which protects an ally.

Who developed nuclear deterrence theory during the Cold War?

Most of the foundational work on nuclear deterrence theory was produced between the late 1940s and mid-1960s. The American economist Thomas Schelling made one of the most influential contributions, arguing in Arms and Influence that military strategy had become the art of coercion and deterrence. Schelling later received the Nobel Memorial Prize for Economics for this work.

What is the difference between deterrence theory and compellence?

Deterrence aims to prevent an adversary from taking an action, preserving the status quo, while compellence attempts to force an adversary to take an action, altering the status quo. Both are forms of coercion, but scholars have consistently found compellence harder to achieve than deterrence.

What is the stability-instability paradox in deterrence theory?

The stability-instability paradox states that when two countries each possess nuclear weapons, the probability of direct war between them decreases sharply, but the probability of limited or indirect conflicts increases. During the Cold War, the United States and the Soviet Union fought proxy wars in Korea, Vietnam, Angola, the Middle East, Nicaragua, and Afghanistan while never engaging each other directly.

Did deterrence theory fail during the 2022 Russian invasion of Ukraine?

Former US national security advisor John Bolton argued in 2022 that deterrence worked in Ukraine but only for Russia. Russia successfully deterred NATO from direct military involvement, while the United States and its allies failed to deter the invasion itself. Philip Breedlove, former Supreme Allied Commander Europe, described NATO as "fully deterred" and Russia as "completely undeterred."

What is minimum deterrence theory and which countries practice it?

Minimum deterrence holds that a state should maintain no more nuclear weapons than necessary to deter an adversary from attacking. China, India, Pakistan, Britain, and France all practice this form. France developed its own independent deterrent under the belief that the United States would refuse to risk its own cities to defend Western Europe in a nuclear exchange.

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