The Oxford Essential Dictionary of the US Military defines deterrence as “the prevention from action by fear of the consequences. Deterrence is a state of mind brought about by the existence of a credible threat of unacceptable counteraction.” From this, readers can deduce that deterrence is a state of mind and a product of rational decision-making.

Basing security policy on either of these assumptions is foolhardy. It is challenging to calibrate deterrence. This requires distinguishing enough deterrence, where credible fear of counteraction keeps the peace, from too much deterrence, where credible fear of an opponent’s motives can lead to a preemptive attack.

First, some practical examples. Returning to October 7, 2023, it is possible to say Israeli deterrence failed. Since 1948 Israel has sought to maintain a level of strength and preparedness sufficient to prevent its enemies from planning and executing attacks, using the threat of overwhelmingly force to maintain deterrence against its enemies.

The first major sign of trouble with this approach came in 1968, months after Israel’s defeat of its Arab neighbors in the Six-Day War, when Egypt began preparing a response. This came in October 1973 with Operation Badr, the attack which kicked off the Yom Kippur War. Similarly, Hamas began planning its 2023 attack immediately after a major defeat nine years before in the Gaza War of July–August 2014.

In both cases, deterrence failed years before the actual attacks. Israel’s overwhelming military superiority simply delayed the inevitable response to a situation its adversaries saw as absolutely unacceptable. Israel, overconfident in its deterrent capability, discounted the danger when intelligence assets began to report trouble. Thus, a single-minded reliance on deterrence actually led to future conflict.

So much for recent practice. On the theoretical side, scholars and practitioners alike have sought to chart the proximate triggers of war. The Athenian general Thucydides offered a multi-dimensional explanation in his History of the Peloponnesian War. He believed conflict resulted from three factors: Phobos (fear), kerdos (self-interest), and/or doxa (honor or reputation).

Deterrence, as we have seen, relies on threats of force which induce phobos, and therein lies a huge problem: it ignores the crucial elements of self-interest and honor or reputation. Thucydides named phobos as a principal trigger for conflict, even as definitions of deterrence, the current paradigm for conflict prevention, cite its reliance on instilling phobos. As the French might say, not only does deterrence fail in practice, but even worse, it does not work in theory.

Nuclear Deterrence and Global Devastation 

The shortcomings of conventional deterrence are well documented. Then there is its younger brother, nuclear deterrence. The story there is much simpler. Recent research on nuclear winter has lowered estimates of the megatonnage of nuclear detonations needed to trigger the phenomenon. Significant global effects leading to the starvation of over a billion people could be triggered by the use of as few as one hundred “small” Hiroshima-sized (total 1.5 megatons) explosions over urban targets.

This is extraordinarily bad news for the nuclear weapons priesthood, which has been chanting slogans of escalation dominance in government ears since the 1960s. The only rational nuclear deterrence that can be relied upon, it now seems, is self-deterrence, where a conflict which seems unwinnable by conventional means is now far more likely to appear unthinkable in nuclear terms.

Seeking a Realistic, Effective Alternative

Eliminating all nuclear weapons is clearly a necessary part of the journey towards lasting peace. But focusing on particular weapons is miscasting the problem and thus misunderstanding the nature of the solution. The world needs a transition away from the deterrence-based para bellum paradigm, the idea that achieving peace requires constant preparation for war, toward a new way of looking at conflict. This article proposes a radically different paradigm, Trinitarian Realism, which rests upon three principal assumptions.

First, in a concept borrowed from the Christian Trinity, one’s individual confession (peccavi) is important, but the collective and universal confession (peccavimus) is crucial in international peacebuilding. All need to recognize that each has sinned and fallen short, that no one comes to the table, any table, anywhere, with completely clean hands. Second, readers must truly grasp Carl von Clausewitz’s “remarkable trinity” in war, combining the irrational (war moves a citizenry to violence, hatred, and enmity); the non-rational (commanders face “the play of chance and probability”); and the über-rational (governments attempt to “subordinat[e war] as an instrument of policy”).

This guarantees wholly unknowable results. As Nassim Nicholas Taleb points out, “What is surprising is not the magnitude of our forecast errors, but our absence of awareness of it. This is all the more worrisome when engaging in deadly conflicts; wars are fundamentally unpredictable (and we do not know it).” Finally, that the July 16, 1945, Trinity event at White Sands, New Mexico, the first nuclear explosion, introduced a global catastrophic risk arising from the multiple and wide-ranging ecological effects of nuclear winter.

A transition away from deterrence can begin by not reflexively demonizing anyone with whom there is a serious disagreement. Softening morality projections and focusing judgment on a better understanding of complex collective emotions is also helpful. We can do this with far greater humility, including recognition that we will get our assessments wrong.

Writing of diplomatic historian and Christian apologist Herbert Butterfield, political scientist Paul Sharp provided the bare bones of a three-dimensional replacement for deterrence which we call strategic compassion: “Butterfield’s writings on Christianity and international relations suggest…the moral principles of self-restraint [as antidote for fear/phobos], empathy [honor/doxa] and charity [self-interest/kerdos] upon which an effective diplomacy should be based.”

Finally, we believe that nations must abandon their attachment to nuclear deterrence postures for the reasons outlined above and must accept the eradication of all nuclear weapons—before they eradicate all of us.

Paul Ingram is a Research Affiliate and former Academic Programme Manager with the Centre for the Study of Existential Risk (CSER) at Cambridge University. Edmond E. (Ted) Seay III is a retired Foreign Service Officer with 26 years’ experience in arms control, disarmament, and nonproliferation. His final assignment was as principal arms control advisor to US NATO Permanent Representative to the North Atlantic Council Ivo Daalder.

Deconstructing Deterrence was originally published on Global Security Review.

The immediate remedy is to provide, through NATO, the military capability Ukraine needs to restore its sovereignty and firmly demonstrate the resolve of the West to deter any further Russian escalation of the conflict. But to accurately answer why such a remedy is needed requires returning to the point at which American deterrence was undermined in the first place.

The Taliban’s swift defeat by December 2001 was brilliant. The defeat of the Iraqi military in 2003 was also brilliant. In both instances, the reaction of many allies and adversaries was to underscore the formidable capability of the US military. To that extent, deterrence was very much enhanced.

But the US and others assumed future wars would be very short duration and, consequently, the American industrial base need not be enhanced. Both assumptions turned out to be incorrect. As a result, much of the deterrent value of these two “successful” missions was lost after nearly two decades of nation building post 2003. The hasty 2021 withdrawal from Afghanistan seriously undermined American deterrence. Despite American forces in Iraq, ISIS developed there, along with multiple Iranian-funded and -armed militias.

In 2008, well before the disastrous withdrawal from Afghanistan, the US failed to forcibly respond to Russian incursions in Georgia and deterrence credibility was weakened. In 2014 Russia invaded Ukraine and the US administration announced that Ukraine was not critical to the nation’s security. The issue was made worse when the Obama administration placed an arms embargo on Ukraine, the victim of aggression. This was seen as peace at all costs, undermining deterrence.

With the 2015 Joint Comprehensive Plan of Action (JCPOA), the US again lost deterrence credibility. America removed sanctions on Iran, released billions in escrowed funds, and then gave Iran a “right to enrich.” This allowed Iran to build an industrial-strength nuclear technology capability, which Israel described as a sanctioned pathway to a nuclear bomb.

In 2022, the US failed to prevent another Russian invasion of more Ukraine territory, further weakening American deterrence credibility. Over the next three years, the Biden administration publicly worried about possible escalation of the war in Ukraine, thus, refraining from providing Ukraine with advanced military technology as well as limiting the types of assets, especially on Russian territory, that could be used.

This took some conventional and nuclear deterrent capability off the table insofar as the United States could or could not use military capability to prevent the very Russian escalation the US most worried about. The US placed most of Russia’s key military and economic assets in sanctuary and signaled to allies and adversaries that the US was less than serious about deterring Russian escalation. In short, America ceded to Moscow the ability to pick and choose to implement the very escalating dangers feared.

Put another way, the US undertook a sort of self-fulfilling prophecy of impotence. To many in the US, and particularly in Congress, this again looked like a prescription for another endless and perhaps fruitless war.

Now the continued Russian threats to use nuclear weapons is what most worries many US policymakers. Ironically, these Russian threats are also thought by many others to be largely bluff, including many congressional supporters of enhanced assistance to Ukraine, which now numbers some 85 senators that support Chairman Lindsey Graham’s (R-SC) Ukraine funding legislation.

Assuming nuclear threats are bluff might be understandable if the US had a robust as opposed to somewhat minimal theater nuclear capability to deter the Russian use of theater or regional nuclear forces.

But as the Strategic Posture Commission October 2023 report underscored, Putin’s repeatedly threatened to escalate to the nuclear level in order to “win” or force the US to stand down. These threats are coming from Putin because Moscow thinks its 2,000 to 4,000 such weapons are enough to intimidate the US with only a hundred gravity bombs on short-range jets in Europe.

Enhancing American theater nuclear systems through the deployment of nuclear submarine-launched cruise missiles (SLCM-N) is now proceeding, but such enhancements may take years. Short- and medium-range cruise missiles aboard aircraft could also be used to close the gap between NATO and Moscow, and those deployments could be forthcoming in a shorter time.

But as Israeli ambassador Dori Gold warned a decade ago, the bad guy’s “clocks” are moving at a different speed than those of NATO, and there is no guarantee that Putin’s threats to use nuclear weapons in the region will not materialize or be fully deterred by new and timely US conventional or nuclear technology.

However, if the United States is to restore Ukraine’s sovereignty, the US and NATO must have faith in the existing deterrent, emphasize determination to move forward, and provide Ukraine with the military capability necessary to achieve these objectives and, with all due speed, upgrade theater deterrent capability. After all, America did not work for decades to end the Soviet empire only to give it back to Moscow, one country at a time.

Peter Huessy is a Senior Fellow at the National Institute for Deterrence Studies.

Restoring Ukraine Sovereignty Requires Restoring Deterrence was originally published on Global Security Review.