Global Affairs Session 109 16 October 2026

IRAN’S HORMUZ CHOKEHOLD BREAKING

Hormuz, the US naval blockade and global consequences

Summary

Iran’s main gambit in the 2026 war was to close the Strait of Hormuz, and put enough pressure on the US (& Israel) to negotiate and leave.

Its pressure on the Strait of Hormuz continues despite partial shipping recoveries and American naval interdiction. Vessel tracking shows severe October disruptions, while some Iranian petroleum products

escaped the blockade.

Iran faces falling crude exports, currency depreciation and inflation. Oman mediates, and Russia, China and India face significant wider consequences.

Hormuz: The world's most dangerous maritime chokepoint

1. War begins: US and Israeli strikes on 28 February triggered a conflict that repeatedly disrupted navigation through Hormuz.
2. Prewar dependence: Approximately one-fifth of globally traded oil and LNG passed through this strategic waterway before the conflict.
3. Iranian restrictions: Tehran imposed shipping restrictions and launched attacks, although commercial vessels continued crossing at reduced and variable rates.
4. October escalation: Two vessels sank after projectile strikes near Hormuz on 14 October; Reuters reported one crew member killed.
5. Strategic geography: The narrow strait connects the Persian Gulf with the Gulf of Oman and global sea routes.
6. Two pressures: Iran threatens commercial navigation, while Washington’s separate blockade targets traffic entering and leaving Iranian ports.

Ships escaping Hormuz: The actual shipping data

1. Low transit count: Kpler recorded seven commodity-vessel crossings on 6 October and ten on 7 October.
2. Weekend plunge: Kpler logged five crossings on 10 October and none registered on 11 October, versus 31 previously.
3. Crude-flow distinction: Kpler estimated 10.1 million barrels daily through Hormuz around 6 October, approximately 74% of prewar volume.
4. Bypass exports: Exports through Gulf of Oman coast and Red Sea routes reached an estimated 6.7 million barrels daily.
5. LPG departures: UANI identified at least eight tankers carrying Iranian LPG leaving the Gulf of Oman since mid-July.
6. Jet-fuel arrival: SynMax tracked a separate Iranian jet-fuel tanker reaching Myanmar; estimated LPG cargoes totalled 4.1 million barrels.

US Navy: Blockade effectiveness and operational limits

1. Two blockade phases: CENTCOM began enforcement on 13 April, suspended it on 18 June, and resumed on 14 July.
2. Official July–October count: CENTCOM reported redirecting 135 commercial ships and disabling four vessels in the renewed blockade.
3. Blockade scope: US forces target shipping entering or leaving Iranian ports, not every vessel traversing Hormuz.
4. Military action: CENTCOM reported disabling the tanker Belma on 15 July after repeated warnings near Kharg Island.
5. Crude export effect: Kpler reported no tracked Iranian seaborne crude shipments during September, despite some later petroleum-product movements.
6. Unresolved security: Iranian attacks continued despite US operations; a US Navy-led centre rated commercial-shipping threats severe.

Oman: The missing link in the Hormuz crisis

1. Coastal states: Oman and Iran border Hormuz, giving both direct roles in negotiating maritime passage and safety.
2. June discussions: Oman and Iran announced consultations on navigation management, maritime services and traffic arrangements after the ceasefire.
3. August proposal: Their foreign ministers discussed a joint temporary corridor and mine-clearing project on 25 August.
4. Agreement pending: Oman's published statement envisaged further technical negotiations, not an already operational permanent shipping corridor.
5. UN fertilizer initiative: A proposed coordination centre in Oman requires US–Iran agreement before managing priority fertilizer shipments.
6. Commercial risk: Iranian-linked ship-to-ship transfers occurred near Oman, while an October drone attack struck a tanker off Sohar.

Iran's economy: The domestic price of confrontation

1. Crude shipments: Vortexa recorded zero tracked Iranian seaborne crude exports from mid-September through its 5 October assessment.
2. Oil afloat: Vortexa estimated 83 million barrels in floating storage, including approximately 43 million west of Hormuz.
3. Falling currency: Bonbast figures cited by Reuters showed roughly 35% rial depreciation against the dollar since July.
4. Severe inflation: Iran's Statistical Centre reported September annual inflation of 73.6%, adding pressure on household purchasing power.
5. Currency intervention: Iranian authorities announced plans to supply up to $2 billion in foreign currency to support the rial.
6. Official disagreement: Central bank governor Abdolnaser Hemmati rejected US assertions of economic collapse despite documented financial deterioration.

IRGC and Khamenei: The wartime power structure

1. Ali Khamenei killed: Iran's former Supreme Leader died during the US–Israeli strikes that began on 28 February.
2. Successor appointed: Mojtaba Khamenei became Supreme Leader in March with substantial backing from the Islamic Revolutionary Guard Corps.
3. Public absence: Reuters reported no new public visual or audio appearance by Mojtaba as of 28 August.
4. Condition uncertain: Iranian officials said Mojtaba was governing privately; independent confirmation of his present medical condition remains unavailable.
5. IRGC command: Ahmad Vahidi leads the Guards, whose decentralised structure enabled continued operations despite senior leadership losses.
6. Maritime adaptation: Reuters reported a US official's account of IRGC observers using small boats after radar losses.

Russia, China, India and the global consequences

1. Russian assistance reported: US intelligence assessments cited by Reuters described Russian satellite imagery and weapons-component support for Iran.
2. Chinese assistance disputed: The same assessments indicated Chinese support, while President Trump publicly said he doubted both countries assisted.
3. Oil-market substitution: Vortexa reported Chinese refiners replacing scarce Iranian barrels with Russian crude during the blockade.
4. India's seafarers: Following an 11 October drone strike near Sohar, nine Indians were rescued and two remained missing.
5. Marine fuel costs: Reuters reported bunker prices more than 70% above prewar levels, encouraging alternative refuelling ports.
6. Food supply concerns: A UN-backed fertilizer transit plan remained stalled without agreement between Iran and the United States.

Conclusion

Hormuz is neither fully closed nor securely reopened.

Iran retains the means to disrupt vessels, while the American blockade has sharply constrained its tracked crude exports.

Oman's proposed corridor remains unimplemented, and maritime attacks continue.

Tehran's economic pressures are severe; Russia and China pursue distinct interests; India bears shipping risks.

So far, there is no decisive victory, collapse, or solution for either side.

Value addition

Glossary and related terms

Strait of Hormuz

Narrow waterway linking the Persian Gulf to the Gulf of Oman, crucial to international energy trade.

Maritime chokepoint

A narrow route where shipping disruption can affect large international trade flows.

LNG

Liquefied natural gas transported by specialised tankers.

Kpler

Commercial shipping and commodity-flow data provider cited for vessel transits and oil-flow estimates.

AIS

Automatic Identification System, a vessel-tracking signal that may not capture every movement.

LPG

Liquefied petroleum gas, a traded energy product distinct from crude oil.

Bypass route

A shipping or pipeline route used as an alternative to a disrupted passage.

UANI

United Against Nuclear Iran, an organisation cited in tanker tracking.

SynMax

Geospatial intelligence provider cited for tracking a tanker carrying jet fuel.

CENTCOM

United States Central Command, responsible for US military operations in its region.

Naval blockade

Military interdiction of specified maritime traffic, here targeting vessels entering or leaving Iranian ports.

Interdiction

Action taken to stop, divert or disable a vessel.

Kharg Island

Iranian island important to the country’s oil export infrastructure.

Ship-to-ship transfer

Transfer of cargo from one vessel to another while at sea.

Floating storage

Oil held aboard tankers instead of being discharged to onshore storage.

Vortexa

Energy and freight analytics provider cited for Iranian crude exports and floating inventory.

Bonbast

Exchange-rate tracking source cited for the Iranian rial.

Rial

Currency of Iran.

Foreign-currency intervention

A central bank or government action intended to influence the local currency market.

IRGC

Islamic Revolutionary Guard Corps, an important Iranian military and political institution.

Supreme Leader

Iran’s highest-ranking political and religious authority.

Radar

Detection technology used to monitor ships, aircraft and other objects.

Sohar

Omani coastal city and port near the Gulf of Oman.

Marine bunker fuel

Fuel used by ships; bunker prices are an important shipping cost.

Fertilizer transit

Movement of agricultural fertilizers through transport corridors.

UN

United Nations, the international organisation referenced in the proposed fertilizer transit arrangement.