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International Relations May 04, 2026 5 min read Daily brief · #6 of 25

Missiles fired at U.S. frigate in Strait of Hormuz, claims Iranian media

Iranian state media reported that two missiles were fired at a US Navy vessel in the Strait of Hormuz after it allegedly ignored warnings from Iran's navy to...

GS Paper 2 (IR Security) GS Paper 1 (Geography)

What Happened

  • Iranian state media reported that two missiles were fired at a US Navy vessel in the Strait of Hormuz after it allegedly ignored warnings from Iran's navy to halt.
  • US Central Command (CENTCOM) denied that any US warship was struck, stating that guided-missile destroyers were "currently operating in the Arabian Gulf after transiting the Strait of Hormuz in support of Project Freedom."
  • CENTCOM confirmed that two US-flagged merchant vessels successfully transited the strait, undercutting Iran's claim that it had forced the warship to retreat.
  • Iran's assertion — that the US entering the strait constitutes a ceasefire violation — reflects a broader deadlock in US-Iran peace negotiations since the ceasefire of April 8, 2026.
  • Iran had previously fired cruise missiles and drones and deployed small boats to target US-flagged ships in the strait; the US military stated that no vessels had been struck and no personnel injured.

Static Topic Bridges

UNCLOS and the Right of Transit Passage Through International Straits

The United Nations Convention on the Law of the Sea (UNCLOS, 1982) is the primary international legal framework governing maritime navigation. It establishes a specific legal regime — "transit passage" — for straits used for international navigation, which is more permissive than the general right of "innocent passage."

  • UNCLOS Part III (Articles 34–45) governs straits used for international navigation and establishes the right of "transit passage."
  • Transit passage applies to all ships and aircraft of all nations, including warships and military aircraft, for the purpose of continuous and expeditious transit.
  • Unlike innocent passage (which applies in the general territorial sea up to 12 nm), transit passage through international straits cannot be suspended by the coastal state.
  • Submarines may transit international straits submerged — this is their normal mode of operation and is specifically protected under transit passage.
  • The Strait of Hormuz qualifies as an "international strait" under UNCLOS because it connects one part of the high seas/EEZ to another (the Persian Gulf to the Gulf of Oman) and is used for international navigation.
  • Iran is a signatory to UNCLOS; the US has signed but not ratified it, though the US recognises its customary international law provisions on navigation.

Connection to this news: Iran's claim that the US warship's entry into the Strait of Hormuz is a ceasefire violation directly contradicts the transit passage regime under UNCLOS, which prohibits coastal states from suspending or blocking passage through international straits.

The Law of Armed Conflict (also called International Humanitarian Law or IHL) governs conduct during armed conflict. The laws of naval warfare — derived from the Hague Conventions, San Remo Manual on International Law Applicable to Armed Conflicts at Sea (1994), and customary international law — set limits on attacks on naval vessels.

  • The San Remo Manual (1994) is the primary modern codification of international law applicable to armed conflict at sea; it covers the targeting of warships, merchant vessels, and neutral shipping.
  • Under the laws of armed conflict, attacking an enemy warship in international waters may be permissible during armed conflict, but attacking neutral shipping or ships of countries not party to the conflict is prohibited.
  • "Warning shots" and boarding procedures are regulated under both UNCLOS and LOAC; firing missiles at a vessel that has not been positively identified as a hostile combatant raises serious legal issues.
  • The principle of distinction (attacking only lawful military targets) and proportionality are core LOAC principles relevant to naval engagements.

Connection to this news: The claimed missile firing on a US warship in the Strait of Hormuz, and the contested narratives between Iran and the US, illustrate a real-world application of the laws of naval warfare and the international law governing straits.

Geography of the Strait of Hormuz and the Persian Gulf

The Strait of Hormuz is flanked by Iran to the north and the Musandam Peninsula of Oman (and the UAE) to the south. It represents the only sea passage from the Persian Gulf to the open ocean and is approximately 167 km long, with a navigable channel roughly 3 km wide in each direction, separated by a 3-km buffer zone.

  • The strait borders: Iran (north), Oman (south/southeast — specifically the Musandam Governorate, an exclave of Oman), and the UAE (south/southwest).
  • The Persian Gulf is a semi-enclosed sea bordered by Iran, Iraq, Kuwait, Saudi Arabia, Bahrain, Qatar, UAE, and Oman.
  • The Gulf of Oman connects the Strait of Hormuz to the Arabian Sea and ultimately the Indian Ocean.
  • The strait is located between approximately 56°E–57°E longitude and 26°N–27°N latitude.
  • Key ports in the region include Bandar Abbas (Iran's main port on the strait), Khor Fakkan and Fujairah (UAE, on the Gulf of Oman side — outside the strait).

Connection to this news: The narrow geography of the strait makes it uniquely susceptible to blockade and confrontation — a single waterway through which warships, merchant vessels, and tankers all must pass, making the US-Iran naval standoff physically unavoidable.

Key Facts & Data

  • UNCLOS adopted: 1982; entered into force: 1994
  • Articles governing international straits in UNCLOS: Part III, Articles 34–45
  • Key principle: Transit passage through international straits cannot be suspended by coastal states
  • Strait of Hormuz dimensions: ~167 km long, navigable channel ~3 km per direction
  • Bordering countries: Iran (north), Oman (south), UAE (southwest)
  • Iran's claim: Two missiles fired at US warship after it ignored warnings
  • US CENTCOM response: No ship was struck; US destroyers successfully transited
  • Ceasefire date (US-Iran conflict): April 8, 2026
  • San Remo Manual (1994): Key codification of laws of naval warfare
  • UKMTO (UK Maritime Trade Operations): Royal Navy-sponsored body monitoring 2.5 million sq. miles of the Red Sea, Indian Ocean, and Persian Gulf, providing real-time alerts to merchant shipping
On this page
  1. What Happened
  2. Static Topic Bridges
  3. UNCLOS and the Right of Transit Passage Through International Straits
  4. Naval Confrontation and International Law of Armed Conflict (LOAC)
  5. Geography of the Strait of Hormuz and the Persian Gulf
  6. Key Facts & Data
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