For decades, the Strait of Hormuz has carried roughly 20 million barrels of oil per day — about one-fifth of global supply — through a channel barely 21 miles wide at its narrowest point. That flow effectively stopped after the United States and Israel launched a massive joint military operation against Iran on February 28, 2026. Oil tankers began piling up on both sides of the strait, and by March 3, tanker traffic had dropped to near zero as Islamic Revolutionary Guard Corps (IRGC) warnings took full effect, with over 150 ships anchored outside to avoid risks.
For decades, the Strait of Hormuz has carried roughly 20 million barrels of oil per day — about one-fifth of global supply — through a channel barely 21 miles wide at its narrowest point. That flow effectively stopped after the United States and Israel launched a massive joint military operation against Iran on February 28, 2026. Oil tankers began piling up on both sides of the strait, and by March 3, tanker traffic had dropped to near zero as Islamic Revolutionary Guard Corps (IRGC) warnings took full effect, with over 150 ships anchored outside to avoid risks.
The US Navy issued a sweeping maritime warning zone covering the Persian Gulf, Gulf of Oman, and North Arabian Sea. Global shipping giants suspended all vessel transits through the chokepoint, while incidents including a commercial vessel struck near the United Arab Emirates and an oil tanker targeted off Oman injured crew members. On March 4, the US activated war-risk insurance via the Development Finance Corporation (DFC) and offered Navy escorts for tankers, as Brent crude surpassed $85 per barrel on March 5 following major P&I clubs' cancellation of coverage effective that day.
Oil markets open with sharp price spike as shipping carriers suspend Hormuz transits
Market
Brent crude opened significantly higher than Friday's $72.87 close as markets priced in the Strait of Hormuz closure. Global shipping giants Maersk, Hapag-Lloyd, and Mediterranean Shipping Company (MSC) announced suspension of all vessel transits through the strait. Ship-tracking data showed 70% reduction in traffic through the chokepoint.
Commercial vessel struck by projectile near UAE; tanker targeted off Oman coast
Maritime Incident
UK Maritime Trade Operations Centre reported at least one ship struck by a projectile in waters near the United Arab Emirates. Oman confirmed an oil tanker off its coast was targeted by Iranian forces, injuring four crew members.
French shipping company CMA CGM announced suspension of vessel passage through the Suez Canal, citing regional security concerns stemming from the US-Israel strikes on Iran and Iranian retaliation.
US and Israel launch Operation Epic Fury against Iran
Military
The United States and Israel launched nearly 900 strikes in the first 12 hours against Iranian air defenses, missile sites, IRGC facilities, and leadership compounds in Tehran, Isfahan, and Qom. Israel used approximately 200 fighter jets to hit 500 military targets.
Trump says Khamenei killed in strike on Tehran
Statement
President Trump and Israeli sources claimed Iranian Supreme Leader Khamenei was killed when seven missiles struck the Tehran district housing his residence, the presidential palace, and the National Security Council. Iran has not confirmed this.
Iran retaliates with missiles and drones across the Gulf
Military
Iran launched approximately 300 missiles in the first 12 hours, targeting US military assets in Bahrain, Kuwait, Qatar, the UAE, Saudi Arabia, and Jordan. Drones struck near Dubai's Burj Khalifa and the Fairmont hotel on Palm Jumeirah. The 5th Fleet headquarters in Bahrain was targeted directly.
IRGC Navy broadcasts closure of Strait of Hormuz
Maritime
Ships in the strait reported receiving radio broadcasts from what claimed to be the Iranian navy, declaring the Strait of Hormuz closed to all transit. The UK Maritime Trade Operations cautioned this was not legally binding under international law.
Oil tankers halt Strait of Hormuz transit
Maritime
Tankers piled up both inside and outside the strait entrance. The US Navy issued a maritime warning zone across the Persian Gulf and surrounding waters, advising commercial vessels to avoid the area. An unidentified vessel reportedly was fired upon by Iranian warships while attempting to transit.
Multiple Gulf states close airspace
Response
The UAE, Qatar, Kuwait, and Bahrain temporarily closed their airspace. Dubai suspended all flights. All four countries condemned Iran's strikes on their territory.
Oman announces 'breakthrough' in nuclear talks
Diplomatic
Oman's Foreign Minister said Iran had agreed to halt uranium stockpiling and accept full verification by the International Atomic Energy Agency (IAEA). The deal would be overtaken by events within 24 hours.
VLCC tanker rates hit six-year high
Market
The cost of hiring a supertanker from the Middle East to China surpassed $200,000 per day, tripling from the start of the year as risk premiums surged.
Iran-Russia joint naval exercises begin in Gulf of Oman
Military
Iran and Russia launched joint naval exercises in the Gulf of Oman and northern Indian Ocean, adding another layer of military activity near the strait.
IRGC begins 'Smart Control of the Strait' naval exercises
Military
Iran launched live-fire naval drills in the Strait of Hormuz, causing GPS and navigation interference for commercial vessels and partially closing sections of the waterway.
MARAD issues shipping advisory for Strait of Hormuz
Advisory
The US Maritime Administration warned of Iranian illegal boarding, detention, and seizure threats to commercial vessels in the Persian Gulf and Strait of Hormuz.
First round of indirect US-Iran talks in Oman
Diplomatic
CENTCOM Commander Admiral Brad Cooper joined indirect negotiations with Iran in Muscat — the first time a senior US military commander had been present at such talks.
Iran seizes two foreign oil tankers near Farsi Island
Incident
The IRGC Navy seized two foreign oil tankers in the Persian Gulf and transferred them to the port of Bushehr, claiming the vessels were involved in fuel smuggling.
IRGC gunboats attempt to seize US-flagged tanker
Incident
Six IRGC Navy gunboats tried to stop the tanker Stena Imperative in the Strait of Hormuz. The vessel continued under escort from the USS McFaul.
Trump announces 'massive Armada' heading to Iran
Statement
Trump declared a large naval force was moving toward Iran and warned that if Tehran did not agree to a deal, 'the next attack will be far worse.'
USS Abraham Lincoln carrier strike group deploys to Persian Gulf
Military
The United States accelerated the movement of a carrier strike group, accompanied by additional Navy and Air Force assets, toward the Persian Gulf region.
Iran warns it is 'ready for war'
Escalation
Iranian officials warned they were prepared for war after President Trump threatened military action in response to Iran's crackdown on nationwide anti-government protests.
Scenarios
1
US Navy escorts tankers through Hormuz under convoy; oil flows resume within days
Discussed by: Bloomberg commodity analysts, Council on Foreign Relations, former US Navy officers
The United States organizes convoy operations similar to Operation Earnest Will in 1987, escorting oil tankers through the strait under naval protection. This requires degrading Iranian anti-ship missile positions and mine-clearing operations first. If Iran's shore-based missile launchers and fast-attack boat fleet are significantly damaged by ongoing strikes, convoys could resume within a week. Oil prices spike sharply but retreat once flows restart. This scenario depends on the US military's ability to suppress IRGC Navy threats while maintaining a presence large enough to credibly protect commercial shipping.
2
Strait remains effectively closed for weeks as conflict widens
Discussed by: CSIS, Lloyd's List, Vandana Hari of Vanda Insights, energy risk consultants
Iran's asymmetric naval capabilities — over 1,500 fast attack boats, naval mines, shore-based anti-ship missiles, and electronic warfare systems — prove sufficient to keep commercial shipping out of the strait even as the US military operates there. Insurance companies refuse to cover vessels transiting the area. With 20 million barrels per day offline, global oil prices surge toward $100 per barrel. Strategic petroleum reserves are tapped by consuming nations, but the physical absence of Gulf crude creates shortages in Asian refineries dependent on these specific grades. The disruption lasts until either Iran's coastal defenses are comprehensively destroyed or a ceasefire is reached.
3
Gulf producers reroute exports through pipelines, limiting damage
Discussed by: Energy analysts at Kpler, International Energy Agency observers, Saudi Aramco watchers
Saudi Arabia and the UAE activate alternative export routes to partially offset the strait closure. The UAE's ADNOC pipeline can move 1.5 million barrels per day to Fujairah on the Gulf of Oman coast, bypassing the strait entirely. Saudi Arabia has the East-West Pipeline (Petroline) capable of carrying up to 5 million barrels per day to Red Sea terminals. Together, these alternatives could restore 6-7 million barrels per day of the 20 million normally transiting Hormuz — still a massive shortfall, but enough to prevent a full-blown supply crisis. Iraq and Kuwait, which lack bypass pipelines, remain cut off.
4
Iran deploys mines in the strait, triggering months-long clearance operation
Discussed by: US Naval Institute, Lloyd's List Intelligence, maritime security firm Dryad Global
Iran lays naval mines across the strait's shipping channels, as it did during the 1980s Tanker War. Even a small number of mines would halt commercial traffic indefinitely, since insurers will not cover vessels transiting mined waters and tanker operators will not risk their crews. Mine clearance in the 21-mile-wide strait — with its strong tidal currents and heavy traffic when operational — could take months. This would represent the most severe disruption to global energy supply since Iraq's invasion of Kuwait in 1990, and would force the activation of strategic petroleum reserves worldwide while restructuring global oil trade flows away from the Persian Gulf.
Historical Context
The Tanker War and Operation Earnest Will (1987-1988)
1987-1988
What Happened
During the Iran-Iraq War, both sides attacked oil tankers in the Persian Gulf, hitting a total of 451 merchant vessels. After Kuwait asked for protection, the Reagan administration reflagged 11 Kuwaiti tankers as American vessels and organized the largest naval convoy operation since World War II, involving up to 30 US Navy ships. Iran laid mines that struck the reflagged supertanker Bridgeton on its first escorted voyage.
Outcome
Short Term
The US Navy destroyed half of Iran's operational naval fleet in a single day during Operation Praying Mantis in April 1988, after the frigate USS Samuel B. Roberts struck an Iranian mine. Despite the fighting, the strait never fully closed, and less than 2% of transiting ships were actually hit.
Long Term
The episode established the precedent that the US Navy would use military force to keep the Strait of Hormuz open. It also demonstrated that even limited mine warfare and asymmetric attacks could not fully close the strait, though they dramatically increased costs and risks for commercial shipping.
Why It's Relevant Today
The current situation has already exceeded the 1980s precedent — the IRGC Navy has far more capable anti-ship missiles and fast attack boats than Iran possessed in 1988, and the 2026 conflict involves direct US strikes on Iranian territory rather than a proxy war between Iran and Iraq. Whether the US can replicate the Earnest Will convoy model against a more capable adversary is the central question for oil markets.
Iraq's invasion of Kuwait and the 1990 oil price shock
August 1990 - January 1991
What Happened
Iraq's invasion of Kuwait on August 2, 1990 took 4.3 million barrels per day of combined Iraqi and Kuwaiti crude oil offline. Oil prices doubled from $21 to $46 per barrel within weeks as markets priced in the possibility that Saddam Hussein would invade Saudi Arabia next. The S&P 500 fell 18%, and the price spike contributed to the early 1990s US recession.
Outcome
Short Term
The US-led coalition's military success in Operation Desert Storm caused prices to collapse almost as fast as they had risen, falling back below pre-invasion levels by early 1991.
Long Term
The crisis accelerated efforts to diversify energy supplies away from the Persian Gulf and led to the expansion of strategic petroleum reserve systems. It demonstrated that sudden removal of several million barrels per day of supply causes immediate economic damage, even if the disruption is ultimately short-lived.
Why It's Relevant Today
The 1990 shock removed 4.3 million barrels per day from markets. A sustained closure of the Strait of Hormuz would remove roughly 20 million barrels per day — nearly five times as much. Even with pipeline alternatives, the potential shortfall dwarfs any previous supply disruption. The 1990 precedent also shows how quickly oil shocks transmit into broader economic damage.
Suez Canal closure (1956-1957)
October 1956 - April 1957
What Happened
After Britain, France, and Israel attacked Egypt during the Suez Crisis, Egyptian president Gamal Abdel Nasser blocked the canal by sinking 40 ships in the waterway. The closure cut off the route through which 66% of Europe's oil imports traveled, forcing tankers to reroute around the Cape of Good Hope — adding thousands of miles and weeks to each voyage.
Outcome
Short Term
Middle East oil's share of Western European imports dropped from 74% to 48% within months. Britain was forced to buy more expensive American and Venezuelan crude. The crisis contributed to fuel rationing in parts of Europe.
Long Term
The closure accelerated the construction of supertankers (VLCCs) designed to make the longer Cape route economically viable, and spurred development of pipelines bypassing the canal. It permanently demonstrated that chokepoint closures reshape global shipping infrastructure.
Why It's Relevant Today
The Suez closure showed that blocking a maritime chokepoint — even temporarily — forces permanent changes in how energy is transported globally. If the Strait of Hormuz remains closed for more than a few days, the same restructuring dynamic could accelerate pipeline construction, strategic reserve drawdowns, and long-term shifts in which suppliers serve which markets.
