In March 2026, the closure of the Strait of Hormuz ceased to be a theoretical contingency discussed in war colleges and became instead a lived global crisis. What policymakers once treated as an unlikely worst-case scenario has hardened into a daily economic shock. Following late-February strikes on Iranian leadership and infrastructure, the Islamic Revolutionary Guard Corps (IRGC) executed a threat that had hovered over global energy markets for decades; it sealed the narrow maritime artery through which a fifth of the world’s oil and a substantial share of liquefied natural gas flows.
The Strait, only twenty-one miles wide at its narrowest navigational corridor, has effectively been transformed into a militarised exclusion zone. The immediate consequences have been dramatic. Oil prices surged toward the psychologically powerful $100-per-barrel mark. War-risk insurance premiums spiked beyond commercial viability. Tanker traffic thinned within days. Strategic petroleum reserves were tapped. The crisis represents not just a geopolitical escalation but a visible breakdown of deterrence itself.
For years, analysts assumed that mutual vulnerability would prevent such a scenario. The argument rested on liberal interdependence because all actors depended on uninterrupted energy flows, none would dare jeopardise them. Iran exported oil through the same waters it now threatens. Gulf monarchies relied on the same sea lanes for revenue. Asian industrial powers depended on uninterrupted supply chains. In theory, the economic cost of closure would amount to mutually assured economic destruction. But that theory failed to account for the psychology of regime survival.
From Tehran’s perspective, the closure is framed as an act of defensive necessity. Iranian officials describe it as asymmetric retaliation against what they characterise as Western and Israeli aggression. The logic is brutally simple; if Iran’s economic lifelines are severed through sanctions and military strikes, then denying others the benefits of global commerce becomes a form of strategic equalisation. In this framing, oil is not a commodity, it is leverage.
Here, deterrence theory becomes central. According to classical deterrence thinking, as developed during the Cold War and analysed by scholars like Phil Williams, deterrence rests on three pillars; communication, capability and credibility. All three appear to have malfunctioned in Hormuz. First, communication. For deterrence to succeed, red lines must be clearly articulated and understood. Iran has long signaled those existential threats to the regime would trigger drastic measures including the closure of the Strait. Western powers, meanwhile, have signaled that interference with global shipping would invite overwhelming retaliation. Yet signaling alone does not guarantee shared interpretation. Each side appears to have believed the other was bluffing. Second, capability. Iran possesses the asymmetric naval tools required to disrupt traffic anti-ship missiles, drones, naval mines and fast attack craft. It does not need to permanently own the Strait. It only needs to make transit too risky to insure. The withdrawal of maritime insurers has proven as effective as missile fire. This demonstrates a modern evolution of deterrence that financial markets now function as force multipliers. Third, credibility. The most crucial element of deterrence is the believable willingness to act. Iran demonstrated credibility by acting. The question now turns to whether the United States and its partners will do the same by forcibly reopening the waterway. If they hesitate, deterrence erodes further. If they escalate militarily, the conflict risks widening dramatically.
What we are witnessing is a form of deterrence failure driven by asymmetry. During the Cold War, nuclear deterrence functioned because both superpowers possessed second-strike capability and understood that total war meant annihilation. In Hormuz, however, the calculus is different. Iran’s strategy resembles deterrence by punishment through economic disruption. It seeks to impose intolerable costs on adversaries indirectly, betting that inflation and political unrest in distant capitals will restrain military escalation. In effect, Iran is attempting to weaponise interdependence. Meanwhile, Washington and its allies frame the blockade as global economic extortion. From their perspective, allowing a single regional power to choke a maritime common undermines the credibility of the entire international order. Freedom of navigation is the foundation of global trade. If Hormuz can be closed through coercion, other chokepoints like Bab el-Mandeb, the Malacca Strait, even parts of the South China Sea become potential arenas for similar tactics. Thus, the stakes extend beyond oil prices. They extend to systemic order.
The economic fallout has been especially severe for Asia. Manufacturing powerhouses that rely on Gulf energy imports now face both supply constraints and spiraling insurance costs. Tankers may technically be seaworthy but without war-risk coverage, they cannot sail. The market’s invisible hand has reinforced the IRGC’s visible threats.
Attempts to bypass the Strait reveal structural limitations. Pipeline alternatives in Saudi Arabia and the United Arab Emirates cannot replicate the daily throughput of Hormuz. Rerouting vessels around Africa adds weeks to delivery schedules and significantly increases freight costs. Liquefied natural gas exports are even more constrained by geographic dependency. Infrastructure redundancy simply does not exist at sufficient scale.
Yet the most enduring consequence of the crisis may be psychological. Markets are built on confidence. Once confidence in the uninterrupted flow of energy collapses, investors recalibrate permanently. Long-term contracts are reconsidered. Strategic reserves are expanded. Diversification accelerates. Renewable energy investments gain urgency for geopolitical insulation.
This is where deterrence theory intersects with long-term structural change. The Hormuz crisis may represent a shift from traditional military deterrence toward economic resilience as deterrence. States may conclude that the best defense against chokepoint coercion is not merely naval superiority, but reduced dependency. In that sense, the 2026 blockade signals the limits of liberal optimism. Interdependence did not prevent disruption, it amplified vulnerability. Realism has reasserted itself. Survival calculations trumped economic rationality. The international system which was once buffered by institutions and trade regimes, now appears more anarchic and brittle.
The pressing question is what comes next. If a multinational naval coalition reopens the Strait swiftly and decisively, deterrence may be partially restored. The message would be clear which maritime chokepoints cannot be unilaterally weaponised without consequence. However, if reopening proves prolonged and costly, a new norm may emerge, one in which strategic waterways are seen as legitimate tools of coercion. That would mark a dangerous precedent. The Strait of Hormuz crisis is not merely an oil shock. It is a stress test for the global order. It tests whether deterrence still functions in a multipolar world where economic tools can rival missiles in coercive power. It tests whether credibility still underpins stability. And it tests whether interdependence is a shield or a vulnerability.
In 2026, the world discovered that chokepoints are the pressure valves of modern globalisation. When one closes, the system convulses. The question is not only whether the Strait will reopen. The deeper question is whether the logic of deterrence which was carefully constructed in the twentieth century can survive the hybrid, economically weaponised conflicts of the twenty-first.
The writer is an Undergraduate Student, International Relations, University of Dhaka
