Attack on Indian-flagged ships heighten uncertainty over Hormuz passage and trade flows

Two Indian-flagged vessels — the VLCC (Very Large Crude Carrier) Sanmar Herald and the bulk carrier Jag Arnav — were fired upon by Iranian gunboats in the St...

What Happened

Two Indian-flagged vessels — the VLCC (Very Large Crude Carrier) Sanmar Herald and the bulk carrier Jag Arnav — were fired upon by Iranian gunboats in the Strait of Hormuz on April 18, 2026, and were forced to turn back despite reportedly having prior clearance to transit.
The Sanmar Herald was carrying approximately 2 million barrels of Iraqi crude oil when it came under fire from two IRGC gunboats; no casualties were reported, but both vessels abandoned their eastward crossings.
Industry experts characterised the attacks as a significant setback, warning that the "managed passage" framework that had operated during the brief ceasefire period had effectively collapsed, triggering a sharp spike in shipping insurance premiums and renewed uncertainty over global oil supply chains.

Static Topic Bridges

Maritime Chokepoints and Global Trade

Maritime chokepoints are narrow waterways where sea lanes converge, creating strategic bottlenecks in global shipping. The world's principal chokepoints include the Strait of Hormuz (Persian Gulf–Gulf of Oman), Strait of Malacca (Indian Ocean–South China Sea), Bab-el-Mandeb (Red Sea–Gulf of Aden), Suez Canal (Mediterranean–Red Sea), and the Panama Canal (Pacific–Atlantic). Disruption at any of these points cascades quickly into global freight rates, insurance costs, and commodity prices.

The Strait of Hormuz handles ~20 million barrels of oil per day (20% of global petroleum consumption) and ~20% of global LNG.
The Strait of Malacca handles ~40% of global trade by volume, including critical India-East Asia flows.
When Bab-el-Mandeb was disrupted by Houthi attacks in 2023-24, shipping costs on the Europe-Asia route rose by 150–200% as vessels were rerouted around the Cape of Good Hope, adding ~14 days to transit.
India's trade is heavily exposed to both Hormuz (energy imports) and Malacca (manufacturing exports/imports).

Connection to this news: The attacks on Indian-flagged vessels at Hormuz directly mirror the Bab-el-Mandeb disruption pattern — armed non-state or state actors targeting commercial shipping at chokepoints to exercise geopolitical leverage.

Flag State Responsibility and UNCLOS Provisions

Under international maritime law, a "flag state" is the country under whose flag a vessel is registered. UNCLOS Article 91 grants every state the right to set conditions for granting its nationality to ships, while Article 94 requires the flag state to exercise effective jurisdiction and control over its flagged vessels in administrative, technical, and social matters. Flag state responsibility means India has both a legal right and an obligation to protect the safety of Indian-flagged ships and their crews.

Indian merchant vessels are registered under India's Merchant Shipping Act; the 2025 amendment modernised ownership criteria, allowing NRIs and OCIs to register vessels under the Indian flag.
UNCLOS Article 110 permits warships to board foreign vessels in limited circumstances (piracy, slave trade, unauthorised broadcasting, statelessness, same nationality as warship) — deliberately excluding political blockade enforcement.
Firing upon a vessel flying a foreign flag in international or Omani territorial waters without legal justification could constitute an internationally wrongful act engaging state responsibility.

Connection to this news: India's right to raise a formal protest with Iran over the attacks derives directly from its flag state status; the incident also tests the limits of UNCLOS protections in active conflict zones.

India's Trade and Energy Exposure to the Gulf

India's economic relationship with the Persian Gulf is multidimensional: it is the country's largest source of crude oil, a major market for Indian exports, and home to the largest community of Indian diaspora workers (approximately 8–9 million Indians in the GCC).

India imports over 85% of its crude oil; roughly 60% of imports come from Gulf producers whose shipments transit Hormuz.
India's total merchandise trade with the GCC exceeded $180 billion in 2023-24.
Remittances from Indian workers in the GCC constitute the single largest source of inward remittances, estimated at over $55 billion per year.
War risk insurance premiums for Gulf-region shipping have surged, increasing the effective landed cost of each barrel of crude oil.
Every $10 per barrel rise in crude oil prices widens India's trade deficit by approximately $15 billion annually.

Connection to this news: The attacks compound India's exposure: higher oil prices, costlier shipping insurance, and potential disruption to the remittances and trade ties that underpin the Gulf-India economic relationship.

War Risk Insurance and Shipping Economics

War risk insurance covers vessels and cargo against losses arising from acts of war, piracy, and hostile actions. It is a separate policy from standard marine insurance (P&I and hull cover). The Joint War Committee (JWC), based in London, maintains a list of "hull war, strikes, terrorism and related perils" areas; vessels entering listed areas must obtain additional war risk cover at significantly higher premiums.

The Strait of Hormuz and Persian Gulf have been on the JWC's high-risk list since at least 2019.
When an area is listed, war risk premiums can be 10–50 times higher than standard cover, sometimes exceeding $1 million per voyage for large crude carriers.
Higher insurance premiums are typically passed on to buyers as a surcharge, increasing the effective cost of imported crude.
Shipping companies may unilaterally refuse to send vessels into high-risk areas, creating supply bottlenecks even when the strait is technically "open."

Connection to this news: The attacks on Sanmar Herald and Jag Arnav confirm the high-risk listing, making commercial shipping through Hormuz both more expensive and less certain regardless of official "clearance" declarations.

Key Facts & Data

Vessels attacked: Sanmar Herald (VLCC, ~2 million barrels of Iraqi crude) and Jag Arnav (bulk carrier), April 18, 2026.
Strait of Hormuz traffic fell by approximately 95% during peak closure, with only a brief partial recovery during the ceasefire.
Brent crude prices rose toward $87 per barrel following the re-closure and attacks.
India imports approximately 4.8 million bpd of crude; Gulf region supplies ~60%.
A $10/barrel rise in crude prices costs India roughly $15 billion annually in additional import expenditure.
India's Strategic Petroleum Reserve: 5.33 MMT at Visakhapatnam, Mangaluru, and Padur (~9.5 days cover).
The Strait of Malacca handles ~40% of global trade by volume; the Suez Canal handles ~12% of global trade.
Remittances from GCC-based Indian workers: estimated over $55 billion annually.