The Strait of Hormuz blockade, explained
Iran announced the closure of the Strait of Hormuz on April 18, 2026, citing the United States' refusal to lift its naval blockade of Iranian ports — an esca...
What Happened
- Iran announced the closure of the Strait of Hormuz on April 18, 2026, citing the United States' refusal to lift its naval blockade of Iranian ports — an escalation stemming from the US–Israel military campaign against Iran that began in late February 2026.
- The US Navy subsequently seized an Iranian-flagged cargo vessel that attempted to bypass the US naval blockade in the Gulf of Oman, further intensifying the standoff.
- The strait has been effectively disrupted since late February 2026 — approximately 50 days of severely constrained maritime traffic — causing major disruptions to global oil and LNG supply chains.
- An estimated 13 million barrels of crude oil, condensates, and natural gas liquids per day have been disrupted during the crisis period.
- Oil prices have surged as a result, impacting import-dependent economies, with India being among the most exposed major economies given its heavy reliance on Persian Gulf energy supplies.
Static Topic Bridges
The Strait of Hormuz — Geography and Strategic Significance
The Strait of Hormuz is a narrow waterway connecting the Persian Gulf to the Gulf of Oman and the Arabian Sea. It is located between the southern coast of Iran (to the north) and the Musandam Peninsula of Oman (to the south). It is universally regarded as the world's most critical oil transit chokepoint.
- Total length of the strait: approximately 167 km (104 miles).
- Width at narrowest point: approximately 33–56 km (21–35 miles).
- Shipping lanes: two unidirectional lanes, each 2 miles wide, separated by a 2-mile median — effectively only a 6-mile usable navigation corridor.
- Daily oil transit (2024–25 baseline): approximately 20 million barrels per day (mb/d), representing roughly 20–21% of global seaborne oil trade.
- LNG transit: approximately 20% of global LNG traded seaborne passes through the strait.
- Key oil exporters routing through Hormuz: Saudi Arabia, UAE, Iraq, Kuwait, Qatar, and Iran itself.
Connection to this news: The closure of this 33-km-wide strait — narrower than many rivers at its shipping-lane level — can instantly remove one-fifth of the world's oil supply from global markets, making any disruption a systemic crisis rather than a regional inconvenience.
India's Energy Import Dependence and Vulnerability
India is the world's third-largest oil consumer and the third-largest importer of crude oil. It meets approximately 85–87% of its crude oil demand through imports, a figure that has grown as domestic production stagnates and industrial/transport demand rises.
- India's oil import expenditure was approximately $132 billion in FY 2024–25.
- India is the second-largest destination for oil transiting through the Strait of Hormuz, receiving approximately 14.7% of all strait oil flows.
- India sourced approximately 40–45% of its crude oil from the Gulf Cooperation Council (GCC) region (Saudi Arabia, UAE, Iraq, Kuwait) in 2024–25 — the overwhelming majority of which transits through Hormuz.
- India and Pakistan together imported nearly two-thirds of their total LNG via the Strait of Hormuz in 2024–25.
- India has limited strategic petroleum reserves: the Strategic Petroleum Reserve (SPR) at Visakhapatnam, Mangaluru, and Padur holds approximately 5.33 million metric tonnes (roughly 15–16 days of import cover at current rates).
Connection to this news: A sustained Hormuz blockade is not a distant geopolitical event for India — it directly threatens energy security, raises inflation through fuel price pass-through, and could adversely affect the current account deficit and rupee stability.
Maritime Chokepoints and Freedom of Navigation
Maritime chokepoints are narrow passages through which significant volumes of international trade pass. Under international law — specifically the United Nations Convention on the Law of the Sea (UNCLOS, 1982) — ships have the right of "transit passage" through straits used for international navigation, a right that cannot be suspended even in peacetime.
- UNCLOS Article 38 guarantees the right of transit passage through international straits — applicable to all ships and aircraft.
- Iran is not a party to UNCLOS but has historically allowed commercial transit through Hormuz.
- Iran has periodically threatened Hormuz closure as a strategic lever, most notably in 2011–12 and 2019–20 in response to sanctions pressure.
- Other critical chokepoints relevant to India's trade and energy: Strait of Malacca (Southeast Asia), Bab-el-Mandeb (Red Sea entry, also affected by Houthi attacks 2023–2025), Suez Canal, Cape of Good Hope (alternative route if chokepoints close).
- The 2026 Hormuz closure is more severe than previous threats: it is backed by active Iranian naval enforcement and a simultaneous US naval blockade, creating a two-sided stranglehold.
Connection to this news: The 2026 crisis tests the limits of the international maritime order — specifically whether transit passage rights can be enforced by non-state actors or states in conflict, and what multilateral mechanisms (UN Security Council, IEA emergency stocks) can mitigate the impact.
Iran's Geopolitical Position and the 2026 Escalation Context
Iran's conflict with the United States and Israel has deep roots in disputes over Iran's nuclear programme, proxy warfare in the region, and attempts to reshape the West Asian order. The 2026 crisis represents the most severe direct military confrontation between the US and Iran.
- The US–Israel air campaign against Iran began in late February 2026, following a period of escalating tensions.
- Iran retaliated by asserting control over the Strait of Hormuz — its most potent economic leverage point.
- Before the crisis, 84% of crude and condensate flows through Hormuz were destined for Asian markets (China ~33%, India ~15%, South Korea ~12%, Japan ~11%).
- Iran's own oil exports (primarily to China) also transited Hormuz, making a complete closure strategically costly for Iran as well.
- The US naval blockade of Iranian ports — the trigger for Iran's April 18 closure announcement — represents a significant escalation beyond airstrikes toward economic warfare.
Connection to this news: India has consistently advocated dialogue and de-escalation in West Asia, partly because its energy security is directly at stake. India's "strategic autonomy" is tested in this crisis: it imports oil from Iran (under sanctions waivers in earlier periods) and from Gulf Arab states, and has refrained from formally condemning either side.
Key Facts & Data
- Strait of Hormuz length: ~167 km; width at narrowest: ~33–56 km; navigable shipping lanes: 2 x 2 miles
- Daily oil transit (pre-crisis baseline): ~20 million barrels per day (mb/d)
- Share of global seaborne oil trade: ~20–21%
- Share of global LNG trade: ~20%
- Disrupted supply in 2026 crisis: ~13 million barrels per day of crude, condensates, and NGL
- Duration of effective disruption (as of April 20, 2026): approximately 50 days
- India's oil import dependence: ~85–87% of crude demand imported
- India's share of Hormuz oil flows: ~14.7% (second-largest destination after China)
- India's strategic petroleum reserve capacity: ~5.33 million metric tonnes (approx. 15–16 days of import cover)
- GCC share of India's crude imports: ~40–45%
- India + Pakistan share of LNG via Hormuz: ~two-thirds of total LNG imports
- Right of transit passage through international straits: UNCLOS Article 38 (1982)
- Asian destination share of pre-crisis Hormuz oil: 84% of crude/condensate flows