A week of dramatic reversals in the Strait of Hormuz has revived talk of a new global oil crisis. What began as Iranian declarations that the strait had been closed and attacks on more than ten tankers shifted into a more calibrated campaign of targeted strikes, punctuated by missile and drone hits on Western-linked vessels and sudden tactical openings that allowed some Asian shipping to pass.
The sequence was rapid and confusing. Between February 28 and March 4 Tehran publicly warned it would stop any ship attempting to transit Hormuz and its forces fired on multiple tankers. Yet on March 3 a POLA tanker switched off its tracking transponder and steamed into the Gulf, while Iranian commanders later clarified that Tehran was not seeking a blanket closure but would act against vessels linked to the United States, Israel, Europe and their allies.
Escalation continued: an Iranian missile reportedly struck a US tanker in the Gulf and the Revolutionary Guard later claimed a drone strike against the USS Lincoln, which withdrew from the area. Washington, in turn, signalled readiness to consider ground operations, and a refinery in Bahrain was struck during the surge in attacks. Markets reacted with panic: crude rallied sharply, with this week’s moves seeing West Texas Intermediate rise by roughly 20% and Brent by about 17%.
The economic fears are not abstract. The piece of sea between Oman and Iran channels roughly a fifth of the world’s seaborne oil; for some importers in Asia it is a primary route. A full and sustained closure would pinch supplies quickly, forcing longer and costlier rerouting and pushing insurance and freight costs higher. Thailand’s near-term vulnerability was a vivid example: with strategic stocks reported at fifty days of supply, Bangkok has reportedly banned exports to preserve domestic needs.
History amplifies the anxiety. The 1973–74 embargo, the 1979 revolution and the 1990 Gulf War each produced sharp oil-price spikes and macroeconomic pain—stagflation in the 1970s and renewed inflationary pressure in 1990. Those episodes prompted countries to build reserves and diversify supplies; yet they also showed how geopolitical shocks can cascade into prolonged economic disruption.
Iran’s calculus appears deliberate. Oil finances are central to Tehran—an estimated 90% of its exports transit Hormuz and oil receipts constitute a large share of state revenue—so a permanent shutdown would quickly inflict self-harm. By shifting from an indiscriminate closure to precision strikes against Western-affiliated targets, Tehran preserves leverage while limiting damage to Asian importers and reducing the risk of total economic strangulation.
Beijing has stepped into the diplomatic breach. Chinese officials have engaged regionally and urged restraint, arguing that the security of the Strait of Hormuz serves the international interest; Beijing also has a material stake, given its dependence on Gulf oil. Other regional players and major powers are now balancing military postures with intense shuttle diplomacy to prevent further escalation.
The immediate outlook is for heightened volatility rather than a calm return to markets. Tehran’s selective pressure keeps the door open for dialogue but also raises the prospect of miscalculation: a single strike that inflicts major Western casualties could provoke a forceful counterreaction. For governments and markets, the episode is a reminder that energy security remains a geopolitical fault line, and that short-term fixes—stockpiles and rerouting—will coexist uneasily with longer-term shifts toward supply diversification and demand-side resilience.