In the Strait of Hormuz, Iran draws its red lines

The Strait of Hormuz — the world's most critical energy chokepoint — was effectively closed to international shipping from late February 2026 following the o...

What Happened

The Strait of Hormuz — the world's most critical energy chokepoint — was effectively closed to international shipping from late February 2026 following the outbreak of the Iran conflict, disrupting approximately 25% of global seaborne oil trade and 20% of global LNG trade
Iran's Islamic Revolutionary Guard Corps (IRGC) issued prohibitions on vessel passage, boarded and attacked merchant ships, and laid sea mines in the strait; in March 2026, the IRGC announced the strait was closed to vessels going to and from the ports of countries involved in military operations against Iran
Iran declared that the only authorised transit routes through the Strait of Hormuz are those designated by Iranian authorities, and that ships must maintain contact with the IRGC Navy while transiting — a direct challenge to the international legal principle of unimpeded transit passage
A memorandum of understanding signed in June 2026 included provisions for toll-free strait reopening for 60 days, mine clearance by Iran within 30 days, and proportional lifting of a US naval blockade — indicating partial resolution but with enforcement uncertainties remaining
India, which imports roughly 85% of its crude oil needs, and which depends heavily on Gulf energy supplies, faces direct strategic exposure from any sustained Hormuz disruption

Static Topic Bridges

The Strait of Hormuz: Geography and Strategic Significance

The Strait of Hormuz is a narrow sea passage connecting the Persian Gulf to the Gulf of Oman and thence to the Arabian Sea. It is bordered by Iran to the north and Oman (including the Musandam exclave) to the south. At its narrowest point, the strait is approximately 33–39 kilometres wide, though the navigable shipping lanes within it are far narrower — two 3-kilometre-wide inbound and outbound lanes separated by a buffer zone. The strait's shallow coastal zones and the concentration of Gulf oil-exporting states behind it make it irreplaceable as an energy corridor.

The strait is approximately 167 km long and lies between latitudes 26°N and 27°N
In 2023–25, approximately 20–21 million barrels of oil per day passed through the strait — roughly 20–25% of global oil trade
There is no economically or operationally comparable alternative route: the Iraqi IPSA pipeline and Saudi Arabia's East-West pipeline have combined spare capacity far below normal Hormuz throughput
Countries wholly dependent on Hormuz passage for exports include Saudi Arabia, the UAE, Kuwait, Iraq, Qatar, and Bahrain; Iran itself also exports through the strait
India is the world's third-largest oil importer; the Gulf region accounts for approximately 60% of India's crude oil imports

Connection to this news: Iran's ability to disrupt or control Hormuz passage — even partially — translates directly into global oil price volatility and supply insecurity, with particular impact on India's economy.

International Law of the Sea: Transit Passage vs. Innocent Passage

The United Nations Convention on the Law of the Sea (UNCLOS, 1982) establishes two distinct legal regimes for passage through straits. "Transit passage" (Articles 37–44) applies to straits used for international navigation between one part of the high seas or EEZ and another; it grants all ships and aircraft — including warships — the freedom of navigation and overflight for continuous and expeditious transit. Critically, coastal states cannot suspend transit passage for any reason (Article 44). "Innocent passage" (Articles 17–32) applies to territorial seas and is more restrictive: it must be non-prejudicial to the peace or security of the coastal state, and warships require prior notification in some interpretations.

UNCLOS Part III (Articles 34–45) specifically codifies the transit passage regime for international straits
Iran is not a party to UNCLOS (it did not ratify the convention); Iran's position is that only innocent passage — not transit passage — applies in the Strait of Hormuz, giving it broader authority to regulate or restrict traffic
The United States also has not ratified UNCLOS but accepts the transit passage regime as customary international law
Most maritime nations and the International Tribunal for the Law of the Sea (ITLOS) regard transit passage as the applicable regime for the Strait of Hormuz
The 1958 Convention on the Territorial Sea and the Contiguous Zone recognised innocent passage through straits but predates the transit passage formulation

Connection to this news: Iran's insistence on routing ships through IRGC-designated lanes and requiring IRGC contact is legally framed as "supervised innocent passage" — directly contradicting the transit passage principle that underpins the global maritime order. This legal dispute has moved from academic to operational significance in 2026.

Chokepoints and India's Energy Security

Maritime chokepoints are narrow passages through which a disproportionate volume of global trade — particularly energy — must pass. Key global chokepoints include the Strait of Hormuz (Persian Gulf exit), the Strait of Malacca (Indian Ocean–Pacific corridor), the Suez Canal, the Bab-el-Mandeb Strait, and the Strait of Gibraltar. For India, three chokepoints are of first-order strategic importance: Hormuz (Gulf oil imports), Malacca (Southeast Asia trade and oil imports from the Far East), and Bab-el-Mandeb (Red Sea access for Europe trade). India's National Maritime Domain Awareness (NMDA) framework and the Indian Navy's evolving blue-water posture are partly shaped by the need to ensure chokepoint access.

India imports approximately 85% of its crude oil requirements; the Gulf accounts for roughly 55–60% of these imports, almost all transiting through the Strait of Hormuz
Strategic Petroleum Reserves (SPR): India has developed underground SPR facilities at Visakhapatnam, Mangaluru (Padur), and Udupi (Padur Phase-II) with a total capacity of approximately 5.33 million metric tonnes — providing roughly 9.5 days of import cover
The International Energy Agency (IEA) recommends member countries maintain 90 days of net import cover; India is not an IEA member but has been an Association country since 2017
India's Indian Ocean strategy — including port infrastructure investments in Chabahar (Iran), Oman's Duqm port, and the Andaman archipelago — is partly designed to hedge against chokepoint vulnerabilities
Brent crude prices spiked sharply following the February 2026 Hormuz disruption, directly affecting India's current account deficit and fiscal calculations

Connection to this news: The 2026 Hormuz crisis is the most severe real-world test of global energy chokepoint vulnerability since the 1973 Arab oil embargo, and it directly tests the resilience of India's energy import infrastructure and strategic reserves.

The IRGC and Iran's Asymmetric Maritime Posture

The Islamic Revolutionary Guard Corps Navy (IRGCN) is a parallel naval force operating alongside the Islamic Republic of Iran Navy (IRIN), with a distinct mission focused on asymmetric warfare in the Persian Gulf and the Strait of Hormuz. The IRGCN operates swarm tactics using fast attack craft, mines, anti-ship missiles, and unmanned systems — designed to impose costs on vastly superior naval adversaries through attrition rather than conventional engagement. The IRGCN has long maintained a doctrine of "closing the Strait of Hormuz" as a deterrent and retaliatory option, though this is the first time since the Tanker War (1984–88) that a sustained disruption has been attempted.

The Tanker War (1984–88) during the Iran-Iraq War was the last major period of systematic attacks on merchant shipping in the Persian Gulf; it led to Operation Earnest Will (US naval escort convoys) and ultimately contributed to the Iran-Iraq ceasefire
The IRGCN's doctrine draws on concepts developed under Rear Admiral Ali Shamkhani and later codified as "mosaic defence" — area denial through distributed, expendable assets
Iran possesses the world's largest inventory of anti-ship mines, estimated at several thousand, including contact mines, influence mines, and rocket-propelled mines
The US Fifth Fleet, headquartered in Bahrain, is the primary naval force responsible for freedom of navigation in the Persian Gulf and the strait; a US naval blockade of Iran was imposed in April 2026 in response to the shipping disruptions

Connection to this news: Iran's 2026 Hormuz actions represent a significant escalation of its traditional deterrent posture into operational execution, demonstrating both the credibility and the limits of asymmetric maritime coercion as a tool of statecraft.

Key Facts & Data

Strait of Hormuz width at narrowest point: approximately 33–39 km; navigable shipping lanes: two 3-km corridors
Global oil transiting Hormuz (pre-war): approximately 20–21 million barrels/day — roughly 20–25% of global seaborne oil trade
Global LNG transiting Hormuz: approximately 20% of world LNG trade
UNCLOS Article 38: guarantees right of transit passage through international straits; Article 44: prohibits coastal states from suspending transit passage
Iran's legal position: innocent passage (not transit passage) applies — Iran has not ratified UNCLOS
India's crude oil import dependence: approximately 85%; Gulf share: approximately 55–60%
India's Strategic Petroleum Reserve capacity: approximately 5.33 million metric tonnes across three sites
Memorandum of Understanding (June 2026): 60-day toll-free reopening, 30-day mine clearance window, proportional US naval blockade lifting
Last comparable disruption: Tanker War, 1984–1988 (Iran-Iraq War)