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From Denial to Punishment: Rethinking Deterrence Theory Through the 2026 US-Iran Conflict
Tahir Azad
Analysis Series
Analysis/0034/June/2026/London-Dialogue. 08 June 2026
When the United States and Israel launched their coordinated strikes against Iran on 28 February 2026, the prevailing assumption in Washington was one of overwhelming coercive superiority. Iran’s air defences had been systematically degraded through the 2025 twelve-day war, its nuclear programme had been substantially set back, and its supreme leader was among those killed in the opening strikes. By any conventional measure of military outcome, the United States and Israel achieved their immediate operational objectives. And yet, within six weeks, Washington had accepted a ceasefire brokered by Pakistan, a ceasefire that left Iran’s successor government in place, the Strait of Hormuz unresolved, and the broader strategic landscape contested. The question this analysis asks is a theoretical one: what form of deterrence, if any, was at work, and what does it reveal about the limits of existing deterrence frameworks?
The Canonical Framework and Its Limits
Classical deterrence theory draws a foundational distinction between deterrence by denial and deterrence by punishment. As Glenn Snyder established in his foundational work, deterrence by denial operates by persuading an adversary that its military objectives cannot be achieved and that the defender possesses sufficient capability to block success on the battlefield. Thomas Schelling, in his seminal Arms and Influence, refined the punishment variant, arguing that coercion ultimately rests on the credible threat of pain rather than the denial of gain. Lawrence Freedman, synthesising the Cold War tradition, further elaborated the prospective logic common to both: deterrence is supposed to prevent an action before it occurs. In both denial and punishment, the mechanism operates ex ante, in anticipation of an adversary’s move.
The 2026 conflict confounds both variants in their classical form. Iran did not deter the United States from striking; the strikes occurred with devastating effect. Denial, in the traditional sense, plainly failed. Nor did Iran’s known capacity for retaliation deter Washington prospectively, despite considerable prior signalling. What happened instead was something the canonical literature does not fully account for: Iran, after absorbing severe military punishment, imposed costs on its adversary through means that were economic and systemic rather than strictly military and did so with sufficient effect to compel a negotiated pause. This is neither denial nor punishment in the classical sense. It is something more accurately described as retrospective or ex post deterrence through asymmetric cost imposition.
The Strait as Strategic Instrument
The centrepiece of Iran’s coercive response was the closure of the Strait of Hormuz, through which approximately twenty percent of the world’s oil and liquefied natural gas passes daily. This was not a military denial operation directed at US forces; it was a systemic disruption of the global energy economy, calibrated to impose costs not merely on Washington’s military capacity but on its domestic political standing and its relationships with allied and partner states.
The effects were rapid and severe. Gas prices in the United States rose to $4.16 per gallon by early April 2026, up from $2.82 at the start of the year. Financial markets fell sharply. The International Monetary Fund warned that global growth would suffer even if the ceasefire held, citing the Strait’s continued closure as a persistent inflationary drag. Iran simultaneously launched sustained missile and drone strikes against US military bases across the region, against Israel, and against civilian and military infrastructure in Arab states, several of which hosted US forces. UK facilities in Bahrain, Qatar, and Cyprus were also struck. By late March, the IRGC signalled it might push Houthi allies to reopen the Bab el-Mandeb front, threatening a second chokepoint and a further turn of the escalatory screw.
The cumulative pressure on the Trump administration was substantial. Public opposition to the war mounted alongside soaring energy costs. Trump had initially demanded Iran’s unconditional surrender, setting successive deadlines of 21 March, 23 March, and then 7 April for a deal. Each deadline passed without the desired outcome. On 8 April, Pakistan mediated a conditional two-week ceasefire that Washington accepted. The war did not end on Washington’s terms.
Compellence, Punishment, and the Coercion of the Stronger
The theoretical significance of these dynamics lies in their challenge to the asymmetry assumption embedded in much Western strategic thought. The dominant tradition holds that superior conventional power, married to escalation dominance, translates into political outcomes. Robert Pape’s work on strategic bombing and coercion, and Robert Art and Kelly Greenhill’s broader scholarship on the use of force, both suggest that coercive instruments tend to work when the target state’s cost tolerance is lower than the coercing state’s capacity to impose harm. The 2026 conflict inverted that calculus in ways neither tradition adequately anticipated.
Iran, operationally defeated at the kinetic level and suffering catastrophic leadership and infrastructure losses, nonetheless retained a capacity to impose costs that exceeded Washington’s political tolerance for the continuation of war. This points to a distinction between two types of asymmetries that deterrence theory has not always separated with sufficient clarity. The first is asymmetry of capability, in which the United States held a decisive advantage. The second is asymmetry of cost tolerance, in which Iran’s willingness to absorb punishment and continue imposing economic costs on the global system proved to be the operative variable. A state fighting for survival, without the domestic political constraints of an elected government facing fuel prices and polling numbers, can sustain costs that a democratic great power cannot easily impose on its own population indefinitely.
Schelling’s insight, developed across The Strategy of Conflict and Arms and Influence, that coercion is ultimately about the manipulation of risk and cost remains valid; what the 2026 conflict adds is that the weaker party can manipulate those costs through instruments, namely global chokepoints and systemic economic disruption, that lie beyond the reach of conventional military suppression. One analytical framing has described the outcome as a condition of mutual economic deterrence rather than decisive victory, in which Iran’s ability to impose global economic costs elevated it to a functional disruptive power, irrespective of its conventional military inferiority. That framing carries its own analytical commitments, but the core observation is sound: coercive dynamics in this conflict were not resolved by kinetic superiority alone.
Towards A Revised Framework
What the 2026 conflict demands is not the abandonment of deterrence theory but its extension. Three revisions to the canonical framework appear warranted.
First, deterrence must be decoupled analytically from its exclusively prospective framing. The concept of ex post or retrospective deterrence, whereby a weaker actor deters continuation of an adversary’s campaign through sustained cost imposition after the opening strikes have landed, deserves theoretical elaboration. This is distinct from both denial and punishment in their classical formulations, and distinct also from compellence in Schelling’s sense, since Iran was not compelling the United States to do something new but rather compelling it to stop a campaign already underway.
Second, the role of economic chokepoints as strategic instruments in deterrence must be integrated into the framework more systematically. The Strait of Hormuz was not a weapons system; it was a geographic asset whose denial value derived from the structure of the global energy economy. Barry Posen’s work on command of the commons, which identified sea lanes and strategic waterways as central to US hegemonic power, points in the right direction but did not fully anticipate the scenario in which a regional power could convert a common into a coercive instrument against the state that nominally dominated it. Future deterrence analysis in the Indo-Pacific context, where the Malacca Strait and Taiwan Strait present analogous dynamics, will need to account for this category of instrument explicitly.
Third, and most broadly, the 2026 conflict reinforces the need to distinguish between military victory and political outcome, a distinction Clausewitz made foundational but which American strategic culture has periodically obscured. Iran was militarily defeated and politically undefeated in the sense that matters: it survived as a state, retained leverage over the terms of any settlement, and demonstrated to regional and global audiences that the United States could be compelled to stop short of its stated war aims.
Conclusion
The 2026 US-Iran conflict does not refute deterrence theory. It reveals the theory’s current boundaries and indicates where those boundaries need to be extended. The movement from denial to punishment, as a conceptual frame, captures part of what happened, but the more precise characterisation is that Iran demonstrated a form of coercive deterrence that operated after conventional military defeat, through asymmetric instruments that the dominant deterrence literature, from Snyder to Schelling to Freedman, has not yet fully theorised. For scholars of strategic studies and for practitioners designing deterrence postures in a world of contested chokepoints and multipolar coercion, that gap is not merely academic. It is a live policy problem.
Tahir Azad
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