An adviser to a commander of Iran’s Islamic Revolutionary Guard Corps said late on March 2 that the Strait of Hormuz had been closed and that Tehran would target vessels attempting to transit the waterway; the IRGC itself had not issued a formal statement. The claim came amid a sharp escalation of hostilities that followed unsuccessful US–Iran nuclear talks and intensive US and Israeli strikes on Iranian leadership and military sites, which Iran answered with retaliatory attacks on military and civilian targets in the Gulf and neighbouring states.
Markets reacted violently. International crude futures jumped more than 10% in early trading, breaking above $80 a barrel, and European gas benchmarks spiked—UK and Dutch TTF contracts briefly rose by over 50% while some European wholesale gas prices surged as much as 40%. Shipping in and around Hormuz slowed to a near halt as tankers turned back, waited at anchor or tried to reroute; reports of ships hit, sharply higher war-risk premiums and insurers issuing cancellation or surcharge notices compounded the disruption.
Traders and strategists say the fallout stems as much from precautionary measures by shipping companies and insurers as from any physical interdiction. Data firm Kpler warned that a combination of safety alerts, higher insurance costs and electronic interference with navigation systems can quickly turn a usually open waterway into one that is effectively impassable. Saxo Bank’s head of commodities strategy described the episode as one of the most serious threats to Middle Eastern energy supplies in years.
The economic significance is immediate. About one-fifth of global oil shipments—roughly 20 million barrels per day—pass through the Strait of Hormuz. Existing alternate pipelines out of the Gulf, principally those in Saudi Arabia and the United Arab Emirates, can absorb only a fraction of that flow: the IEA and Goldman Sachs estimates suggest spare pipeline capacity of up to roughly 4.2 million barrels per day, leaving roughly 16 million barrels vulnerable to disruption.
The risk is not limited to crude. Qatar, the world’s second-largest LNG exporter, suspended output at two trains after drone strikes hit facilities at Ras Laffan and Mesaieed, together supplying about one-fifth of global LNG. That pause threatened roughly 15% of the European Union’s LNG imports and escalated competition for U.S. cargoes. With European gas stocks low—below 31% versus 40% a year earlier—the market reaction fed broader inflationary anxieties across the Atlantic.
For central bankers the timing is awkward. The episode rekindles memories of 2022, when commodity shocks from the Ukraine war amplified inflation and forced rapid rate hikes. Economists warn that sustained higher energy and freight costs would transmit into producer and consumer prices, complicating plans to loosen policy. Market-implied odds of an ECB rate cut before year-end have already fallen and U.S. inflation gauges, including PCE measures closely watched by the Fed, could rise if crude remains elevated.
The geopolitical calculus also constrains Tehran. Iran has long treated Hormuz as a strategic lever, yet it depends heavily on the same channel for its own exports; pipeline alternatives for Iran are underused. Analysts caution that while Tehran may wield temporary disruption as pressure, a prolonged full closure would harm Iranian revenue and regional trade as much as it would global buyers.
Even if military escalation is contained, the economic effects could persist. Shipping reroutes, rising war-risk insurance and a lasting risk premium on Middle East flows would keep energy and shipping costs structurally higher, pressuring trade balances and exchange rates—especially in Asian economies that rely on Middle Eastern oil and gas. Policymakers in Tokyo, Singapore and Jakarta have signalled close monitoring; some central banks stand ready to intervene in foreign-exchange markets if needed. The immediate challenge for global markets is to judge whether this episode will be a short-lived spike or the start of a more entrenched premium on energy and logistics costs.