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.

So sure was Israel in its southern security that intelligence reports were downplayed; the military even redeployed troops from Gaza prior to the October 7. The brutality of the attack and horror at the hostage crisis left Israel so shocked that it delayed a ground invasion for 20 days.

Despite the delay, calls for ceasefire and accusations of genocide existed before Israel’s offensive began. All the same, every first-semester international relations student knew what would happen next: with Hamas no longer deterred, Israel’s only recourse was compellence.

Compellence theory is simply acting on the threat that keeps your adversary deterred. Israel needed to compel Hamas to surrender the hostages, disarm, and realize that attacking Israel is a bad idea—restoring deterrence. For nearly two years since, Israel has tested compellence theory; at best, with mixed results, not only with Hamas, but across the region.

The Lebanese terror group Hezbollah launched its own attack on October 8, 2023, which by the end saw the launch of approximately 10,000–15,000 rockets and 2,500 drone attacks that displaced at least 70,000 Israelis and killed 75 soldiers and 45 civilians. Israel’s effort to restore deterrence devastated Hezbollah, killing 2,500–3,000 fighters, eliminating the majority of its leadership, through an exploding beeper attack in advance of a ground invasion. Seeing their losses, the group agreed to partially disarm and stay out of further hostilities, being effectively compelled.

In Yemen, the Houthis likewise joined the attack on Israel with rocket and drone attacks, as well as targeting ships off its coast, causing significant supply-chain disruptions. The attacks prompted the United States (US) to designate them a terrorist group and launch an aerial campaign alongside the United Kingdom—on top of Israel’s responses.

The Houthis endured severe damage to its offensive infrastructure and lost hundreds of fighters but still managed to occasionally launch limited attacks. The Houthis are more weakened than compelled.

Iran, the financier of Hamas, Hezbollah, and the Houthis, for the first time acted against Israel directly. Retaliating against Israeli strikes, Iran launched ballistic missile and drone salvos against Israel in April and October of 2024. The tit-for-tat came to a head over 12 days in June 2025, as the two exchanged strikes while Israel tried to destroy Iran’s nuclear weapons program.

Though the damage Iran’s nuclear capability took is debated, what is known is Israel’s air superiority destroyed nearly all of Iran’s defense framework and eliminated several senior military staff.

Israel endured significant damage as Iran managed to breach its defenses on a few occasions, and the two have since agreed to a ceasefire, while simultaneously pledging readiness to attack in the future. So perhaps, they are mutually deterred for now.

Syria recently entered a new phase of its civil war following the downfall of Assad, an Israeli push to expand its buffer region, and the emergence of the Hayat Tahrir al-Sham (HTS) faction. HTS is led by Abu Mohammed al-Julani, an Islamic State affiliate who recently began targeting members of Syria’s minority populations, largely the Druze.

Israel intervened to protect the Druze, striking HTS sites until Julani quickly agreed to withdraw his troops from the Druze-populated areas. Prior to that intervention, there were rumors of Syria joining the Abraham Accords. While compellence worked to protect the Druze in the short term, it may have derailed a long-term peace deal.

Hamas remains the outlier. Ceasefire talks are again looking to collapse. The message is that despite the devastation, loss of leadership, approximately 17,000 lost fighters, and thousands of civilians killed in the crossfire, it can endure more. Israel’s attempt at compellence was so intense, that it sparked worldwide protests and allegations of genocide. Yet, rather than agree to Israel’s terms, Hamas continues to hold out, giving a statement that they will continue to fight until a Palestinian state is established.

The US attempted to broker multiple ceasefires, with some success in November 2023 and January 2025, but a deal to end the conflict remains elusive. If the US wants real results, compellence should target Hamas’ hosts and financiers, Turkey and Qatar.

While publicly on good terms with the US, the argument that Turkey and Qatar are state sponsors of terrorism would not be difficult to make given the support and protection they have offered Hamas. President Trump could threaten to add Turkey and Qatar to the list of state sponsors of terror unless Hamas agrees to Israel’s terms of ending the war.

There are indications that this could work. At least publicly, the two countries recently joined with Saudi Arabia and Egypt in a call on Hamas to disarm and relinquish control of Gaza to the Palestinian Authority. This is a good first step, but the call has no “or else”–type clause that would actually pressure Hamas.

With that support gone, Hamas’ political leadership’s only choice would be deportation from its hosts which would likely jeopardize their finances and potentially put them within Mossad’s reach or accede to Israel’s conditions. Ever self-interested, the hope is they would be compelled to the latter. This type of diplomatic pressure directed at Hamas’ sponsors could trickle down to Hamas’ leadership and potentially be the last best hope for Gazan civilians as Israeli Prime Minister Benjamin Netanyahu signals plans for a renewed military offensive in the enclave.

Whether deterrence is restored by Israel is yet to be determined. For the sake of civilians on both sides, let us hope it is restored and soon.

Justin Leopold-Cohen is a homeland security analyst in Washington, DC. He has written widely on national and international security issues for outlets including Small Wars Journal, the Wavell Room, and Inkstick Media. Any views expressed in the article are his own and not representative of, or endorsed by, any organization or government.

Failed Deterrence and Misplaced Compellence in Gaza was originally published on Global Security Review.