What Happened
- The European Union formally condemned Iran's proposal to impose a toll on ships transiting the Strait of Hormuz, the world's most critical maritime chokepoint for oil and gas trade.
- An EU spokesman stated that international law — specifically the UN Convention on the Law of the Sea (UNCLOS) — "provides for freedom of navigation, which means basically no payment or toll whatsoever."
- Iran has floated the toll proposal as part of a broader demand for international recognition of its sovereignty over the Strait — a condition it has linked to any diplomatic resolution of tensions with the United States and Israel.
- A pending bill in Iran's legislature would formally codify Iranian sovereignty over the Strait and create a permanent revenue mechanism through transit fees.
- The UN's International Maritime Organization (IMO) has described any toll on Hormuz passage as a "dangerous precedent" that would undermine the foundational principle of freedom of navigation.
Static Topic Bridges
The Strait of Hormuz — Geographic and Strategic Significance
The Strait of Hormuz is a narrow waterway between the Persian Gulf and the Gulf of Oman, located between Iran on the north coast and Oman and the UAE on the south coast. It is approximately 104 miles long, with its navigable width around 24 miles at its narrowest point. The strait contains two 2-mile-wide shipping lanes separated by a 2-mile buffer zone. It is universally regarded as the world's most critical maritime chokepoint for energy trade — disruption here affects oil and LNG markets globally. An average of 138 commercial vessels pass through it daily.
- Location: Between Iran (north) and Oman/UAE (south); connects Persian Gulf to Gulf of Oman and Arabian Sea.
- Oil flows (2025): Approximately 15 million barrels per day (bpd) of crude — nearly 34% of global crude oil trade.
- LNG flows (2025): Over 112 billion cubic metres (bcm) — approximately 20% of global LNG trade.
- Shipping lanes: Two 2-mile-wide lanes; ~138 commercial vessels/day.
- Asian dependence: 89.2% of crude oil and condensate transiting Hormuz goes to Asian countries; China and India together receive 44%.
Connection to this news: The EU's alarm is proportional to the strait's role as the backbone of global energy supply chains — any toll or closure would send energy prices across Europe and Asia into crisis territory.
UNCLOS — United Nations Convention on the Law of the Sea
UNCLOS, adopted in 1982 and entered into force in 1994, is the comprehensive international treaty governing the rights and responsibilities of nations regarding ocean use. It codifies the principle of freedom of navigation, defines maritime zones (territorial sea — 12 nm; EEZ — 200 nm; high seas), and crucially establishes a special legal regime for international straits. UNCLOS has been ratified by 169 countries. Notably, neither the United States nor Iran is a party to UNCLOS — but the transit passage regime for international straits is recognised as customary international law binding on all states.
- UNCLOS adopted: December 10, 1982 (Montego Bay, Jamaica); entered into force November 16, 1994.
- India: Ratified UNCLOS in 1995.
- Territorial sea: 12 nautical miles (nm) from baseline — sovereign territory of coastal state.
- EEZ: Up to 200 nm — sovereign rights over resources, but freedom of navigation applies.
- Freedom of navigation on high seas: Article 87 — all states enjoy freedom of navigation on the high seas.
- Iran and US: Neither is a UNCLOS signatory, yet the transit passage regime is binding under customary international law.
Connection to this news: Even without formal UNCLOS membership, Iran cannot legally impose a toll under the transit passage regime — the EU's objection precisely invokes this customary international law principle.
Transit Passage — UNCLOS Articles 37–44
UNCLOS Part III (Articles 34–45) establishes the legal regime for "international straits" — waterways used for international navigation connecting two areas of high seas or EEZ. Ships and aircraft enjoy the right of "transit passage" through such straits: the right to continuous and expeditious navigation without interference or suspension. This is a stronger right than "innocent passage" (which can be suspended). Coastal states cannot levy charges merely for transit — only for specific services actually rendered (e.g., pilotage).
- Article 37: Transit passage regime applies to straits used for international navigation between high seas/EEZ.
- Article 38: All ships and aircraft enjoy the right of transit passage — cannot be impeded or suspended.
- Article 26: Coastal states cannot charge ships for mere passage through territorial sea; only for specific services rendered.
- Article 42: Coastal states may adopt laws on transit passage only in limited areas (safety, pollution) — cannot hamper transit.
- Hormuz context: Shipping lanes pass through Omani and Iranian territorial waters — Iran cannot unilaterally impose a toll without violating international law.
Connection to this news: Iran's toll proposal directly conflicts with Article 38 (no impediment to transit) and Article 26 (no charges for mere passage) — the EU is essentially citing these provisions in its objection.
Iran's Strategic Position and the Hormuz Leverage
Iran has long considered the Strait of Hormuz a strategic lever in geopolitical negotiations. Iranian law (notably the Iranian Maritime Zones Act and various parliamentary bills) asserts sovereign authority over the strait and the right to "control" transit. The current proposal — emerging amid conflict with the US and Israel — represents Iran's attempt to monetise this leverage. However, international law experts and the IMO note that Iranian sovereignty over the strait does not include the right to levy transit tolls, as the transit passage regime overrides coastal state commercial interests in international straits.
- Iran's southern coast borders the Strait of Hormuz; it shares control of shipping lanes with Oman.
- Iran has previously threatened to "close" the strait during tensions (2011–2012, 2019, 2020).
- The Iranian Parliament's draft legislation would "formally codify sovereignty" and create a "permanent revenue stream."
- IMO (UN's maritime body) called the toll proposal a "dangerous precedent."
- The strait's shipping lanes lie in both Iranian and Omani territorial waters — Oman has not endorsed any toll.
Connection to this news: The EU's response represents a formal international legal objection — not merely a diplomatic protest — underlining that freedom of navigation is non-negotiable under the current structure of international maritime law.
Key Facts & Data
- Strait of Hormuz: ~104 miles long; navigable width ~24 miles at narrowest; two 2-mile shipping lanes.
- Daily crude transit (2025): ~15 million barrels per day — ~34% of global crude oil trade.
- LNG transit (2025): Over 112 bcm — ~20% of global LNG trade.
- Daily vessel traffic: ~138 commercial vessels.
- Asian countries: Receive 89.2% of crude transiting Hormuz; China + India = 44%.
- UNCLOS: Adopted 1982; in force 1994; 169 states parties; India ratified 1995.
- Transit Passage regime: UNCLOS Articles 37–44 — continuous, expeditious passage; cannot be suspended or charged.
- Article 26 UNCLOS: No charges for mere passage; only for specific services rendered.
- Neither the US nor Iran is a UNCLOS signatory — but transit passage is customary international law.
- IMO position: Toll on Hormuz transit would be a "dangerous precedent."