The Insurance Weapon: How War-Risk Underwriting Closed the Strait of Hormuz

Date: June 1, 2026 Type: WEEKLY DEEP DIVE Reading Time: ~10 min Panels: Maritime Analyst, Macro-Economist, Historian

TL;DR

• The Strait of Hormuz did not close because anyone cancelled core insurance. Poolable P&I cover, including the third-party pollution liability behind CLC and Bunkers Convention “blue cards,” is non-cancellable mid-term and reinsured through the International Group pool and the London market. Ships kept their blue cards. The strait closed on price and risk terms instead.
• The real cost lever was the hull war-risk additional premium, written in the London and Lloyd’s market separate from P&I. It surged from ~0.05-0.2% of hull pre-crisis to ~1.5-3% generally, up to ~5% for US, UK, and Israel-linked tonnage, spiking briefly toward ~7.5-10% at the late-March peak for the highest-risk transits. At 3% of a $100M VLCC that is ~$3M per voyage; ~$5M at 5%; ~$7.5-10M only at the brief peak.
• What several clubs actually cancelled, some on ~72-hour notice around March 5, were the non-poolable charterers’-liability war-risk extensions and similar ancillary war covers, not the core P&I entry. Combined with the Lloyd’s Joint War Committee Listed-Area designation and acute owner and charterer risk aversion, that made transit commercially unviable for most flags.
• The combination did what no single cancellation could: daily transits collapsed from ~138 to 10-20, 800+ vessels backed up, 22+ ships hit across 40 days of war. An underwriting-and-risk-driven de facto blockade, even though core P&I technically stayed in force.
• The thesis held. The Apr 7-8 two-week ceasefire was extended indefinitely on Apr 21, and a tentative 60-day MoU floated May 28 sits unsigned. The strait remains effectively shut on the water, transits near zero since ~May 6. War-risk cover has eased somewhat but is not normalized. The insurance weapon outlasted the military campaign, exactly as this article argued.

Six Circulars, One Morning

At 00:01 GMT on March 5, 2026, the London market woke up to a cluster of overlapping circulars. Gard, Skuld, NorthStandard, London P&I, American Club, and Steamship Mutual, between them connected to ~80% of the global oceangoing fleet, issued cancellation notices on the non-poolable war-risk covers they could actually pull: charterers’-liability war-risk extensions and similar ancillary war add-ons, several with ~72-hour notice. What they did not do, and could not do, was withdraw the core poolable P&I entry. That cover, including the third-party pollution liability that underpins CLC and Bunkers Convention blue cards, is non-cancellable mid-term and sits behind the International Group pool and the London reinsurance market. Ships kept their blue cards.

The circulars were not coordinated in the collusive sense. They did not need to be. Each club’s loss committee ran the same math independently and reached the same conclusion: the discretionary, non-poolable war extensions were no longer worth writing into the Gulf. By March 5, Day 5 of Operation Epic Fury, ten commercial vessels had been hit by Iranian kamikaze drones. Seven crew were dead. The IRGC had declared the strait closed, while the Foreign Ministry, in characteristically contradictory fashion, denied any formal closure. Lloyd’s Joint War Committee had already added the Persian Gulf to its Listed Areas, the designation that drives the hull war-risk additional-premium surge. The clubs followed the data on the only covers they controlled.

The hull war-risk additional premium is the separate lever, and it did the heavy lifting. It is written in the London and Lloyd’s market, distinct from the P&I entry, and the JWC listing pushes it up automatically. Over the next five weeks the underlying loss data got worse. By Day 40 of the closure, 22+ ships had been hit. The Al-Salmi, a fully laden Kuwaiti VLCC, was struck by an Iranian drone at Dubai anchorage on March 31, the first loaded tanker hit at a major port, extending the threat envelope to every vessel in the Gulf, not just those attempting transit. Forty-eight hours later the Aqua 1 was hit in Qatar’s territorial waters. On April 4 the IRGC claimed a strike on MSC Ishyka in Hormuz itself, a claim debunked by AIS data showing the vessel moored at Bahrain’s Khalifa Bin Salman Port, but the false claim alone spooked underwriters.

The premium math tells the story. A standard VLCC (a Very Large Crude Carrier, the workhorse of Gulf oil trade) carries a hull value of ~$100 million. Pre-crisis, hull war-risk for a Hormuz transit ran at ~0.05-0.2% of hull value, so ~$50,000 to $200,000 per voyage, already elevated by the 2024-2025 Houthi campaign in the Red Sea slowly repricing Gulf-adjacent risk. By early March the additional premium had moved to the ~1.5-3% range generally, with US, UK, and Israel-linked tonnage quoted up to ~5%. At the late-March peak, for the highest-risk transits, quotes spiked briefly toward ~7.5-10%. On a $100M hull that is ~$1.5-3M per voyage at the general rate, ~$5M at the 5% mark, and ~$7.5-10M only at the brief peak. Underwriters did not stop quoting; they priced for the risk, and at those levels most charterers walked.

For a shipowner, the voyage economics fell apart and stayed apart, even with blue cards technically valid. The owner who still held core P&I now faced a hull war-risk bill of ~$3M and up, a charterers’-liability war extension that had been pulled out from under the fixture, and a charterer who would not take the exposure. Pre-crisis, a VLCC loading 2 million barrels at Ras Tanura for Ningbo carried total freight and insurance cost of ~$900,000. By Day 40 that same voyage, where it could be fixed at all, cost in multiples that would have looked absurd six weeks earlier. VLCC day rates ran past $1 million, well above the $423,736 record that stunned the market in early March. A round-trip Yanbu-to-Rotterdam cargo approached $40-50 million. Freight cost per barrel hit $12-15, up from $2-3 in peacetime. No charterer could justify the exposure. No shipowner would send a $100 million asset into a Listed Area for a margin that no longer existed.

The result was near-instant and only deepened. Daily transits through the Strait of Hormuz dropped from ~138 to 10-20 under Iran’s selective regime, and those residual transits were almost all whitelisted nations (Pakistan, India, China, Japan) or government-chartered emergency runs. Over 800 commercial vessels backed up into the Gulf of Oman, the Arabian Sea, the Fujairah roads, and Gulf anchorages, four times the 200+ figure from early March. Twenty million barrels per day of flow dropped to effectively zero for Western-linked shipping. The strait closed on risk and price, not on a cancellation of all cover.

How Underwriting Closes a Strait

To see why this matters, and why it may matter more than the drones, look at the layers of cover a commercial vessel carries. Every ship in international trade runs three: hull and machinery (H&M), covering the physical vessel; Protection and Indemnity (P&I), covering third-party liabilities including crew injury, pollution, and collision; and cargo insurance, covering the goods aboard. War risk is a separate overlay. Hull war risk is bought as an add-on to the H&M policy, written in the London and Lloyd’s market. There are also non-poolable war covers tied to P&I, such as charterers’-liability war-risk extensions, that a club can issue or cancel at its discretion.

The mechanism that closed Hormuz was not one switch but a stack. First, the hull war-risk additional premium surged into the ~1.5-5% range on the JWC listing and the loss data, so the steel got expensive to insure for the transit. Second, clubs cancelled the non-poolable charterers’-liability war extensions, so the party that charters the vessel lost the cover that made it comfortable taking the cargo. Third, the JWC Listed-Area designation flagged the whole zone, hardening every quote. Fourth, owners and charterers turned acutely risk-averse with 22+ ships hit. Core P&I and the blue cards stayed in force the whole time. That was enough to keep the legal ability to enter port intact, and still not enough to put a single Western charterer on the water.

This stack is more effective than a traditional naval blockade and cheaper to sustain. A naval blockade needs warships, sustained patrol, and the political will to fire on violators. It is expensive, diplomatically provocative, and legally fraught under maritime law. The underwriting squeeze needs a JWC meeting, a London market that reprices risk, and a handful of club circulars on discretionary covers. It is quiet, immune to diplomatic protest, and enforced not by gunboats but by price, by withdrawn extensions, and by owners who will not sail.

Iran’s IRGC understands this. The drone attacks on commercial shipping were never meant to sink the global tanker fleet (that would take thousands of drones and invite a decisive military response). They were meant to generate enough loss events to drive the war-risk additional premium to prohibitive levels and to make every club’s discretionary war cover untenable. Twenty-two ships hit. Hull war-risk into the ~5% range, peaking near 7.5-10%. Charterers’-liability extensions pulled. Mission served, at a cost of perhaps a few hundred Shahed-type drones at $20,000-50,000 each. The total drone hardware bill, ~$10-20 million, helped freeze ~$2 trillion in annual oil trade by pricing the transit beyond what any charterer would pay, even with core cover still valid. The Al-Salmi strike at Dubai anchorage proved no vessel in the Gulf was safe, not just those attempting transit. The Aqua 1 hit in Qatari waters extended the threat to the territory of a nation Iran calls a “neighbor and friend.” The message to underwriters landed.

Historical Precedent

The war-risk lever has been pulled before, never at this scale, but the mechanism is well established.

The Tanker War (1984-1988). During the Iran-Iraq War, both belligerents attacked oil tankers in the Persian Gulf. Iran targeted Kuwaiti and Saudi-flagged vessels supporting Iraq; Iraq targeted Iranian exports from Kharg Island. Over four years, 451 ships were attacked and over 400 seamen killed. Lloyd’s war-risk premiums for Gulf transits surged to 1-2% of hull value at peak, in the same band as the general rate today though below this crisis’s peak. But the Tanker War never fully closed the strait. Transits fell by ~25-30%, not ~98%. The difference: attacks were sporadic and geographically diffuse, conducted by aircraft and patrol boats that convoy escorts could deter. The US reflagging operation of 1987, placing Kuwaiti tankers under American flags with Navy escorts, restored confidence and brought premiums back down within months. Today’s drone-driven mechanism runs on different economics. Drones are cheap, expendable, and hard to intercept at scale. Escort convoys cut risk but cannot remove it, which is why underwriters had not repriced down off the French carrier group deployment.

Suez Crisis (1956). When Egypt nationalized the Suez Canal and the Anglo-French-Israeli invasion followed, the canal was physically blocked by scuttled ships. But even before the blockage, marine insurers had withdrawn coverage for canal transits. The insurance withdrawal preceded physical closure by ~48 hours, a reminder that the market moves faster than military reality. Post-crisis, clearing the wrecks took four months, but coverage was restored within weeks of a ceasefire once the UN Emergency Force established a security perimeter. The lesson: war-risk repricing is fast in, slow out, and responds to credible security guarantees.

Gulf War (1990-91). Iraq’s invasion of Kuwait and the coalition war triggered war-risk repricing for the entire northern Persian Gulf. Lloyd’s Listed Areas expanded to cover all waters north of 29 degrees N. Premiums spiked, but the disruption was shorter because the coalition established air and naval supremacy fast. The strait itself was never threatened; only the loading terminals in Kuwait and northern Saudi Arabia. Cover normalized within weeks of the ceasefire. The current crisis is more severe because the mechanism targets the strait itself, the 21-mile-wide chokepoint through which all Gulf traffic must pass, not terminals that can be bypassed.

How this time is different. In every prior case, the market repriced or withdrew war cover in response to state-on-state military action and normalized it when a credible security framework (UN force, coalition supremacy, or durable ceasefire) was established. This crisis has no clean parallel, differing in three dimensions: (1) the mechanism is asymmetric and low-cost, so Iran can sustain it without conventional military superiority; (2) the scope is total, with ~100% of strait traffic affected, not a subset of flagged vessels; and (3) no credible security framework has yet held, even after a ceasefire. The French escort coalition deployed but stayed unproven. The US reinsurance facility was doubled to $40 billion on April 6 with eight partners (DFC, Chubb as lead underwriter, plus AIG, Berkshire Hathaway, Travelers, Liberty Mutual, Starr, and CNA). That facility backs hull, machinery, and cargo, not the war-risk premium that prices the transit or the charterers’ confidence that the cover under the fixture will hold. It insures the steel, not the voyage.

By the Numbers

Metric	Pre-Crisis (Feb 2026)	Day 10 (Mar 10)	Day 40 (Apr 8)	Change (Feb to Apr)
Hull war-risk add’l premium (% hull)	~0.05-0.2%	~1.5%+	~1.5-5%, peak ~7.5-10%	sharply higher
Per-voyage war-risk cost (VLCC)	~$50K-200K	~$1.5M+	~$3-5M, peak ~$7.5-10M	sharply higher
Total freight cost (VLCC, Gulf to Asia)	~$900,000	$4,000,000+	$40-50M (Yanbu-Rotterdam round-trip)	sharply higher
Freight cost per barrel	~$2-3	~$4-5	$12-15	+400-650%
VLCC day rate	~$35,000-55,000	$423,736 (record)	$1,000,000+	sharply higher
Hull value (standard VLCC)	~$100,000,000	~$100,000,000	~$100,000,000	Unchanged
Daily Hormuz transits	~138 (avg)	2-3	10-20 (selective)	-86 to -93%
Vessels trapped/waiting	~10-20 (normal)	200+	800+	sharply higher
Ships attacked (total)	0	~10	22+	sharply higher
Charterers’ war extensions pulled	0	6 clubs	6 clubs	non-poolable only
Core P&I / blue cards	In force	In force	In force	Never withdrawn
Oil flow through Hormuz	~20M bbl/day	~0 bbl/day	Ceasefire; conditional	-100% (pre-ceasefire)
Brent crude	~$73/bbl (Feb avg)	~$110/bbl	~$94/bbl (post-ceasefire crash)	+28.8%
US reinsurance facility	0	$20B (DFC+Chubb)	$40B (8 partners)	+100%

The per-voyage economics deserve a closer look. Take a VLCC loading 2 million barrels of Arab Heavy at Ras Tanura, bound for Ningbo, China, the single most common trade on earth before March 2026.

Pre-crisis voyage cost stack:

• Freight (time charter equivalent): ~$500,000
• Hull war-risk additional premium (~0.1% of hull): ~$100,000-200,000
• Bunker fuel: ~$150,000
• Port charges and canal fees: ~$50,000
• Total: ~$900,000 (~$0.45/barrel)

Day 40 voyage cost stack (where fixable at all):

• Freight (spot market at $1M+/day rates): ~$8,000,000+
• Hull war-risk additional premium (~3% of hull general; up to ~5% for US/UK/Israel-linked; ~7.5-10% at the brief peak): ~$3,000,000-5,000,000, peaking ~$7.5-10M
• Bunker fuel: ~$250,000 (fuel price inflation)
• Port charges: ~$50,000
• Risk premium / crew bonus: ~$500,000+
• Mine risk surcharge (new): ~$1,000,000+
• Total: ~$13,000,000-$17,000,000+, peaking higher (~$6.50-$8.50/barrel)

That $6-8/barrel increase in transport cost is already embedded in Brent’s war-era pricing. But the binding constraint is not the per-barrel figure; it is that the stack pushes the all-in cost past what any charterer will pay and pulls the discretionary war cover out from under the fixture. Core P&I and blue cards stayed valid the whole time. The transit still did not happen, because the price and the withdrawn extensions and the Listed-Area flag together made it commercially impossible.

Who Benefits

Every disruption creates winners. The Hormuz squeeze has reshuffled maritime risk geography in ways that will persist after the strait reopens.

Alternative route operators. Tankers on Atlantic Basin routes (West Africa to Europe, US Gulf to Asia via the Cape of Good Hope) are commanding premium rates as refiners scramble for non-Hormuz crude. The Cape route from the Arabian Sea to Europe adds 10-15 days versus Suez, but it avoids both Hormuz and the Houthi-threatened Bab el-Mandeb, making it the safest option for Gulf-origin crude loaded at Fujairah via the UAE bypass pipeline.

Russian crude and the sanctions arbitrage. Russia’s seaborne crude exports, already moving under a Western price cap and shadow-fleet insurance, have become the most cheaply insured barrels in the market. Russian crude does not transit Hormuz. The shadow fleet already operates outside the P&I club system, using opaque insurers in Dubai, Mumbai, and Hong Kong. India has surged Russian crude purchases to 1.37 million barrels per day, up 30% from February. Urals has flipped from a $13/bbl discount to a $4-5/bbl premium on a delivered basis. The squeeze meant to close Hormuz is inadvertently financing Russia’s war economy.

Red Sea risk repricing. Saudi Arabia’s bypass strategy, tripling Red Sea exports via Yanbu to 2.5 million barrels per day, has created a new flashpoint. Yanbu-loaded tankers must transit the Bab el-Mandeb, where Houthis have shown persistent anti-ship capability with Iranian-supplied drones and missiles. On March 28 this risk materialized: Houthis formally joined the war, launching ballistic missiles at Israel and threatening to close Bab el-Mandeb itself. A Houthi deputy information minister stated explicitly: “Closing the Bab al-Mandeb strait is among our options.” The Saudi East-West Pipeline’s 2.5 million barrels per day bypass now runs through a Houthi fire zone. Hull war-risk for Red Sea transits, already elevated from the 2024-2025 Houthi campaign, is climbing further as VLCCs loaded at Yanbu carry $200 million in crude at current prices. The Listed Area designation remains in effect and the dual-chokepoint risk is now operational, not theoretical. If Houthis escalate from missiles-at-Israel to missiles-at-tankers, the war-risk market could price the Saudi bypass route out and collapse the only significant workaround to the Hormuz closure.

Northern Sea Route. The Arctic route from Russia’s Pacific coast to East Asia, historically a niche summer-only passage, is drawing speculative interest as a Hormuz-independent pathway. Chinese and Russian state shippers have expanded icebreaker capacity in recent years. The route is ice-bound until June-July, but if the Hormuz crisis extends into Q3 2026, expect accelerated investment in Arctic shipping infrastructure and insurance products.

What to Watch

1. War-risk repricing and conditional cover for escorts: The earliest signal of genuine reopening will come not from diplomats but from underwriters. Watch for the London market quoting hull war risk back toward ~1% for escorted convoys, and for clubs reinstating charterers’-liability war extensions on Gulf fixtures. This will likely require a demonstrated track record of 3-5 successful coalition escort transits with zero incidents, plus confirmation that the mined waters have been swept. Until premiums fall and the extensions come back, the strait stays commercially closed regardless of diplomatic developments.

2. Mine clearance timeline: The market’s key variable. Iran deployed thousands of mines; only 44 minelayers have been destroyed, and the US has just 3 LCS available for mine countermeasures, with MCM technology reliable only ~30% of the time. DIA assessment: Iran could keep the strait shut 1-6 months via mines alone. Underwriters will not price war risk back down for a mined waterway, ceasefire or not.

3. Lloyd’s Joint War Committee Listed Area revision: The JWC meets regularly to review Listed Areas. A narrowing of the Persian Gulf exclusion zone (for example, limiting it to the strait narrows rather than the entire Gulf north of 26 degrees N) would signal that underwriters see a pathway to partial reopening and lower additional premiums. An expansion to include the Gulf of Oman would signal escalation.

4. US $40B reinsurance facility activation: The expanded facility with eight partners is the largest government backstop for maritime risk in history, but it remains a policy instrument, not a market one. It covers hull, machinery, and cargo, not the war-risk premium that prices the transit. Watch for the first actual policy written under this facility and whether it pulls commercial war-risk quotes down in practice.

5. VLCC day rate trajectory: Rates exceeded $1 million per day at the peak. A sustained drop below $500,000/day signals the market believes reopening is real. A rebound above $800,000/day signals the ceasefire is not holding. The rate is the market’s real-time truth serum.

6. Ceasefire durability: Kuwait intercepted 28 Iranian drones targeting oil infrastructure and power stations on the morning of April 8, hours after the ceasefire was announced. Lavan refinery and Sirri Island saw explosions of unknown origin post-ceasefire. If the ceasefire collapses, oil snaps back to $120+ and the war-risk market hardens further, possibly for the rest of this conflict cycle.

7. Crew willingness to sail: Maritime unions, particularly the International Transport Workers’ Federation (ITF), can declare the strait a no-go zone for crew safety reasons, independent of insurance status. With 22+ ships hit and mines active, crew refusal is a third enforcement mechanism beyond drones and price: labor. No captain will volunteer to be the test case while ordnance is in the water.

Epilogue: The Ceasefire That Proved the Thesis

On April 7, ~two hours before Trump’s “Power Plant Day” deadline, Pakistan brokered a two-week ceasefire. Iran agreed to reopen the Strait of Hormuz “via coordination with Iran’s Armed Forces and with due consideration of technical limitations.” Oil crashed: Brent fell 13.8% to ~$94, WTI fell 16.3% to ~$94.55, the worst single-day drop since April 2020. Equity futures surged. Headlines declared the crisis easing.

The water did not.

On the morning of April 8, only two ships attempted transit through the strait: Tour 2 (a US-sanctioned Iranian Suezmax) and NJ Earth (a Greek-owned bulk carrier with possible AIS anomalies). Eight hundred vessels remained backed up. Hull war-risk quotes stayed in the multi-percent range. The charterers’-liability war extensions stayed pulled. Maersk, the world’s largest container line, said the ceasefire “does not yet provide full maritime certainty.” CMA CGM and Hapag-Lloyd remained suspended on Hormuz and Red Sea transits. Core P&I and blue cards were never the issue; they had been valid throughout. The thing that kept ships off the water was price, withdrawn discretionary cover, mines, and crew risk.

That is the core insight. A ceasefire is a political event. War-risk normalization is a risk event. The two run on different timelines and respond to different inputs. Diplomats respond to rhetoric, domestic pressure, and face-saving formulas. Underwriters respond to loss data, mine clearance verification, and demonstrated safe transit. Iran’s “technical limitations” caveat, a reference to the thousands of mines still active in the strait, is precisely the language that keeps the war-risk market from softening. It was true in Suez in 1956, true in the Tanker War in 1988, and true today at a scale that dwarfs all precedent. The war-risk weapon is the slowest to activate and the slowest to stand down, and in the gap between ceasefire and commercial normalization, trillions of dollars of trade stay frozen.

The strait may be “open” in the political sense. In the commercial sense, the only sense that moves oil, it stays closed.

Update (Day 94, June 1, 2026)

The thesis held. The Apr 7-8 two-week ceasefire was extended indefinitely on April 21, and a tentative 60-day memorandum of understanding floated on May 28 remains unsigned. None of it has reopened the strait on the water. Transits have run near zero since ~May 6 despite the political de-escalation, because the underwriting and risk picture is what governs sailing decisions, and that picture has only partly improved. Hull war-risk additional premiums have eased off their late-March ~7.5-10% peak but have not normalized; they sit well above pre-crisis levels, and clubs have been cautious about reinstating the charterers’-liability war extensions they pulled in March. Core P&I cover and blue cards remained in force the entire time, as they were always going to. The strait did not close because anyone cancelled the non-cancellable. It closed on price, on withdrawn discretionary cover, on the JWC listing, on mines, and on risk aversion, and it has stayed closed on the same terms even as the diplomats moved on. That gap between political de-escalation and commercial normalization is the whole point.

Sources

• Lloyd’s List: “No, P&I clubs have not ‘cancelled war risk cover’” (clarifies poolable P&I and blue-card cover is non-cancellable mid-term; what was cancelled were non-poolable charterers’-liability war extensions); VLCC day rates ($1M+/day at peak; $423,736 record, Mar 7); traffic and attack reporting
• P&I club circulars: cancellation notices on non-poolable charterers’-liability war-risk extensions, ~72-hour notice around Mar 5 (Gard, Skuld, NorthStandard, London P&I, American Club, Steamship Mutual); core P&I entries not withdrawn
• Lloyd’s Joint War Committee: Listed Area designation for the Persian Gulf, the driver of hull war-risk additional-premium surcharges
• London / Lloyd’s hull war-risk market: additional premium ~0.05-0.2% pre-crisis, rising to ~1.5-3% generally, up to ~5% for US/UK/Israel-linked tonnage, brief peak ~7.5-10% late March
• IMO/UKMTO: vessel attack reports (22+ ships through Day 40)
• Insurance Journal, S&P Global: war-risk premium reporting (Apr 2-3)
• Kpler: vessel anchoring data (800+ ships backed up, Apr 8); near-zero transits since ~May 6
• Bloomberg, Al Arabiya: Saudi Red Sea export data (786K to 2.5M bbl/day)
• CENTCOM: strike counts (13,000+ targets by Day 39), 130+ ships destroyed, 44 minelayers destroyed
• US DFC: $40B reinsurance facility for hull/machinery/cargo (expanded Apr 6; DFC + Chubb + AIG + Berkshire Hathaway + Travelers + Liberty Mutual + Starr + CNA)
• Maersk: ceasefire “does not yet provide full maritime certainty” (Apr 8)
• Bloomberg, CNN, Al Jazeera: Al-Salmi VLCC struck at Dubai anchorage (Mar 31); Aqua 1 struck in Qatar waters (Apr 1)
• Maritime Executive, MarineTraffic: MSC Ishyka claim debunked via AIS data (Apr 4)
• Ceasefire chronology: two-week ceasefire Apr 7-8; extended indefinitely Apr 21; tentative 60-day MoU floated May 28 (unsigned)
• TankerBrief Crisis Situation Report (Day 94, 2026-06-01)
• Historical references: Lloyd’s of London archives (Tanker War premiums, 1984-88); Suez Crisis shipping records, 1956; Gulf War maritime insurance data, 1990-91