From Rejection to Acceptance: Why Iran Agreed to a Ceasefire

After more than a month of an intense regional war, a ceasefire between Iran and the U.S. has de-escalated the conflict, at least for some time, as international efforts toward a broader agreement continue. Recent commentary talks about the diplomacy that resulted in the ceasefire, but a critical question remains: why did Iran agree to a ceasefire it initially opposed?

For close to six weeks, Iran suffered significant leadership and material losses amid the U.S and Israel striking key targets, yet it developed meaningful leverage. To this end, it demonstrated its ability to disrupt energy supplies flowing through the region, thereby imposing significant costs on its adversaries that depend on the stability of the global economy. The strategy was the linchpin of Iran’s asymmetric warfare through which it could compensate for its military disadvantage and operational degradation.

Yet, despite the advantages offered by its asymmetric warfare strategy, Iran agreed to a two-week ceasefire, hammered out through mediation efforts spearheaded by Pakistan. I argue that Iran’s ceasefire decision was driven by mounting fears of an imminent and perilous escalation that would have offset asymmetric dividends.

Strategic Leverage and Its Limits

Realizing that the U.S. and Israel had overwhelming power and clout, Iran’s strategy was based on harnessing its limited military capabilities while leveraging its biggest natural advantage: geography. The overarching objective was not just to jeopardize but also to essentially play havoc with energy supplies originating in the region.

Iran blocked the Strait of Hormuz, through which roughly 20 percent of oil and gas shipments pass. Geography was weaponized, and the Strait turned into a powerful lever during the crisis. Meanwhile, Iran used its missile and drone capabilities to attack oil and gas facilities in the region.

In the short run, the Iranian strategy produced results. The U.S. and its GCC allies, whose economies remain sensitive to energy supply volatility, were unnerved. Global energy markets were hit hard, and oil and gas prices skyrocketed, compounding the geopolitical risks the war posed. Iran demonstrated that, despite its limited military capabilities and damage to its weapons arsenals and military infrastructure, it could not be coerced easily.

However, the leverage-oriented Iranian strategy was fundamentally unsustainable and thus unreliable. Its basis was the problematic assumption that the U.S. and its allies would tolerate energy supply disruptions for an extended time period and refrain from pursuing decisive escalation to punish Iran, especially given their disproportionate military capabilities. The assumption soon began to evaporate as Iranian leverage ratcheted up the costs imposed on its adversaries, making it unrealistic for the latter not to go up the escalation ladder and achieve escalation dominance.

Escalation Threshold

The key factor that compelled Tehran to agree to a ceasefire was the U.S. threat to unleash overwhelming military force against Iran, in particular its power plants and civilian infrastructure. As the war lingered on, putting the strategic patience of the U.S. to a difficult test, Washington announced that it would pursue sharp escalation if Iran did not meet its key demands, notably the opening of the Strait of Hormuz.

This could not be dismissed as mere rhetoric. The U.S. found itself in a precarious situation – it did not want to get drawn into another endless war in the region, but neither could it pull out and expect Iran to de-escalate and open the Strait. Sharp yet calibrated escalation thus surfaced as a possible course of action, preceded by a credible threat thereof. Even if the U.S. were not to take such a path immediately, it could have given a go-ahead to the Israelis, who have recently been trigger-happy vis-à-vis their enemies in the region. It is for this reason that media reports suggesting that Israel was waiting for a green light from Washington began cropping up.

Faced with an emerging quagmire, Iran radically changed course as its strategic calculus changed radically. Initially opposed to any ceasefire, Iran agreed to one. Crucially, the decision came 90 minutes before the U.S. ultimatum to accept a ceasefire or face decisive action – not after – suggesting that Tehran deemed the American threat credible.

Prolonging the war, which allowed Iran to incrementally levy costs on its adversaries, could no longer promise similar results with a U.S. threat looming. Instead, it created risks that adversaries would dramatically climb up the ladder, especially when they could, to a point where Iran could face existential consequences. It merits noting here that in asymmetric conflicts, this constitutes a critical inflection point: the weaker player’s capacity to impose costs is stymied by a clear vulnerability to overwhelming retaliation—or punishment.

Constraints and Domestic Vulnerabilities

Beyond escalation risks created by the U.S. threat, Iran’s decision to accept a ceasefire was shaped by a growing realization among decision-makers that the costs of a prolonged war were becoming unsustainable. Iran could use its leverage to impose costs on its adversaries, but the damage it sustained in the war with much more powerful players was colossal and mounting. The U.S. and Israel were rapidly striking not only military targets but also critical infrastructure, including energy and industrial sites. Even universities were not spared.

Such damage was becoming increasingly untenable, given Iran’s limited resilience. While global markets that Tehran was exploiting can overcome disruptions over time, a country like Iran has limited capacity to recover from crises. Iran not only lacks a robust economic structure but has also been crippled by international sanctions. Politically, it has faced widespread protests over its inability to run the economy and deliver good governance. Under such conditions, the strategy of disruption becomes a double-edged sword – it could levy costs on adversaries, yet the consequent prolonging of war came at the expense of self-harm.

It is safe to assume that the cost-benefit calculus manifested itself in internal debates in Iran over the merits and demerits of a protracted war. While some hawkish groups may favor continued fighting, the pragmatists are likely to call for strategic caution, despite the desire to resist external aggression.

The pragmatist stance was best articulated by Iran’s former foreign minister Javed Zarif, who suggested that a prolonged war would inflict unsustainable damage on Tehran, calling on the country to end the conflict in its broader national interest. Moreover, as he notes, even the potential “destruction of the region’s infrastructure [by Iranian forces] will not compensate Iran’s losses.”

Conclusion

The key lesson served by the U.S.-Iran ceasefire is not that diplomacy prevailed, but that escalation dynamics forced Tehran, and—by the same token—Washington, to avoid a dangerous threshold. While Iran demonstrated its ability to disrupt global energy supplies and impose real costs on its adversaries, it felt bound by redlines underpinned by its vulnerabilities to further escalation by U.S. and Israel, possibly together with their GCC allies.

When the conflict moved closer to those redlines, expedited by the threat of overwhelming force coupled with unbearable domestic costs, escalation risks overshadowed the incentives for Iran to keep employing strategic leverage and, as a corollary, prolonging the war. The ceasefire is thus reflective of the limits of strategic leverage that became too evident and compelling for any side, particularly Iran, to ignore.

Whether this respite from war brings a broader settlement of the conflict remains to be seen. Nevertheless, what is increasingly clear is that the escalation dynamics remain tricky and, if not heeded and adapted to by Iran and its adversaries, can generate a more dangerous conflict that mars the region and the world in the future.

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