What Happened
- As hostilities in West Asia escalate, global insurers are rushing to cancel or refuse renewal of war risk insurance covers for vessels transiting the Strait of Hormuz and surrounding Gulf waters.
- Without valid war risk cover, ships are legally unable to operate in designated high-risk zones — effectively halting transits even if the strait remains physically open.
- Several tankers have already paused or diverted from Hormuz routes in response to the insurance crisis.
- War risk premiums for Gulf transits have spiked sharply, dramatically increasing the cost of oil and goods transported through the region.
- The insurance market retreat is creating a secondary blockade effect on shipping, separate from any military closure.
Static Topic Bridges
War Risk Insurance: The Lloyd's Joint War Committee System
Marine insurance in international shipping is divided into two distinct policy types. Standard marine hull and cargo insurance covers normal commercial risks (weather, accidents, equipment failure). War risk insurance is a separate policy covering losses caused by war, civil war, revolution, rebellion, insurrection, and terrorism. The two are always underwritten separately, and war risk cover must be specifically obtained before a vessel enters a high-risk zone.
The Joint War Committee (JWC) is the industry body that designates maritime high-risk zones. It is composed of twelve underwriting representatives from Lloyd's of London and the International Underwriting Association (IUA). The JWC maintains an official "Listed Areas" risk register, updated based on assessments by independent security consultants against an "enhanced risk benchmark."
- Ships entering a JWC-listed area are required to notify their war risk underwriter and pay a "breach premium" — calculated as a percentage of the full hull value for a seven-day period in the zone.
- During the Red Sea Houthi attacks (2023–24), war risk premiums for Red Sea transits spiked from near-zero to over 1% of vessel value per transit.
- If underwriters decide to cancel cover (rather than just price it higher), vessels have no legal pathway to enter the zone — effectively a commercial blockade.
- War risk cancellation clauses typically give 48 hours' notice, allowing insurers to exit positions rapidly.
- Hull war insurance underwriters can also refuse to renew annual policies for vessels regularly transiting listed areas.
Connection to this news: The JWC's designation of Gulf/Hormuz waters as enhanced-risk zones has triggered mass cancellations and non-renewals of war risk policies, creating a de facto shipping paralysis in the region even before any physical closure of the strait.
The Economics of Maritime Insurance and Shipping Costs
War risk premium spikes cascade rapidly through global commodity prices. When insurance costs rise for a shipping route, freight rates on that route increase commensurately, as shipping companies pass costs to charterers, who pass them to buyers.
- The "freight rate" on a tanker voyage includes the base hire, bunker fuel costs, port charges, and insurance (including war risk premium when applicable).
- During the Red Sea crisis of 2023-24, overall shipping rates on affected routes increased 2–5 times.
- For India, higher freight rates on crude oil imports mean a higher import bill — even if the oil price itself doesn't change.
- "War risk insurance" is also required for cargo (not just hull): cargo insurers add war risk riders, increasing the landed cost of all goods.
- The Lloyd's market handles the majority of the world's marine war risk coverage, making JWC decisions globally consequential.
Connection to this news: As insurers retreat from Hormuz coverage, the effective cost of oil transit through the strait rises sharply — contributing to global price inflation in crude oil and derived products even if physical supply is not yet disrupted.
UNCLOS and the Law of the Sea on International Straits
Under the United Nations Convention on the Law of the Sea (UNCLOS, 1982), vessels of all states enjoy the right of "transit passage" through international straits used for international navigation. Unlike the right of innocent passage through territorial seas, transit passage cannot be suspended or denied even for national security reasons.
- UNCLOS Article 38: All ships and aircraft enjoy the right of transit passage through straits used for international navigation.
- Article 44: States bordering straits shall not hamper transit passage and shall not suspend it.
- Iran is not a party to UNCLOS (it has not ratified it), but the customary international law principle of transit passage is generally accepted.
- Iran's legal claim to close the strait would have no basis in international law — but enforcement relies on naval power, not legal instruments.
- The US has historically interpreted freedom of navigation in the Gulf as a core national interest and maintains the Fifth Fleet at Bahrain to enforce it.
Connection to this news: While international law prohibits any unilateral closure of the Strait of Hormuz, the insurance market's response demonstrates that commercial deterrence (not just military deterrence) is shaping whether shipping continues in practice.
Key Facts & Data
- JWC composition: 12 underwriting representatives from Lloyd's and IUA (International Underwriting Association)
- War risk premium trigger: breach premium = percentage of hull value for 7-day zone entry
- Red Sea precedent (2023-24): war risk premiums rose from near-zero to >1% of vessel value per transit
- UNCLOS Article 38: transit passage right through international straits (cannot be suspended)
- Iran's status: not a party to UNCLOS (did not ratify)
- US Fifth Fleet headquarters: Manama, Bahrain (Gulf region enforcement)
- Policy cancellation notice period: typically 48 hours under war risk clauses
- Strait of Hormuz daily tanker traffic: approximately 20–21 laden tankers per day (2024 average)