The U.S.-Israeli strikes on Iran that began on February 28 have produced an immediate military response from Tehran, including retaliatory attacks across the Gulf and threats against shipping. But the mechanism that has actually closed the Strait of Hormuz to commercial traffic is not military action alone. It is the withdrawal of maritime insurance coverage that has made transit economically impossible for most operators. The Joint War Committee of the London insurance market has expanded its high-risk maritime areas to include the strait and surrounding waters. War risk insurance premiums have surged to six-year highs. Major shipping lines, unable to obtain coverage at viable rates, have halted operations. The de facto closure is an insurance event masquerading as a military one, and the regulatory implications extend far beyond the energy market.
The maritime insurance framework operates through a layered structure of hull and machinery coverage, protection and indemnity clubs, and war risk policies. Under normal conditions, these coverages function seamlessly and at costs that are a minor fraction of total shipping expenses. When the JWC designates an area as high-risk, war risk premiums spike to levels that can exceed the value of the cargo being transported. A tanker carrying $100 million worth of crude through an area where war risk coverage costs 1-2% of hull value per transit faces an insurance cost that fundamentally alters the economics of the voyage. When coverage becomes unavailable at any price, as it has for many operators in the strait, transit becomes impossible regardless of the military situation.
The regulatory architecture governing maritime insurance is decentralized and market-driven, which makes coordinated intervention difficult. The JWC, which comprises representatives from Lloyd’s and the International Underwriting Association, operates independently from government regulation and makes its designations based on assessed risk rather than political considerations. Governments can subsidize war risk coverage through state-backed insurance schemes, as several nations did during the Iraq-Iran “Tanker War” of the 1980s, but establishing such schemes requires legislative action and intergovernmental coordination that typically takes weeks or months.
India and Pakistan have dispatched naval destroyers to escort tankers in the Gulf of Oman, but naval escort does not solve the insurance problem. P&I clubs and war risk underwriters require that the underlying risk to the vessel be reduced to an insurable level, not merely that a naval presence exists in the vicinity. Escort operations reduce risk but do not eliminate it, and the insurance market’s assessment of residual risk determines whether coverage is available. Until insurance markets judge that the strait is safe enough to underwrite commercial transit, physical escort cannot substitute for the financial mechanism that makes transit possible.
Iran has established its own transit channel north of Larak Island, with the Islamic Revolutionary Guards Corps assessing tolls in Chinese yuan. The regulatory status of this arrangement is unprecedented: a state actor is charging for passage through an international waterway using a mechanism that sits outside the established legal framework governing the strait under international maritime law. The pricing, reportedly $2 million per vessel, reflects Iran’s monopoly position over an alternative route and its leverage over operators who cannot obtain commercial insurance for the main shipping channel. The yuan denomination adds a geopolitical dimension that challenges the dollar’s dominance in global maritime commerce.
For investors, the insurance mechanism reveals a vulnerability in global trade infrastructure that most portfolio construction frameworks do not account for. The closure of the world’s most critical energy chokepoint was accomplished not by a naval blockade but by the market-driven withdrawal of financial services that make transit possible. The regulatory implication is that the financial infrastructure supporting global trade, including insurance, letters of credit, and payment systems, represents a systemic risk that is distinct from the physical infrastructure of ports, pipelines, and shipping lanes. Portfolios that are stress-tested against physical supply disruptions but not against financial infrastructure withdrawal are incomplete in their risk assessment.
