Iran says it closed Strait of Hormuz as Israeli strikes on Lebanon continue

Iran declared the Strait of Hormuz closed to all commercial vessel traffic on June 20, 2026, less than 48 hours after the United States and Iran signed a his...

What Happened

Iran declared the Strait of Hormuz closed to all commercial vessel traffic on June 20, 2026, less than 48 hours after the United States and Iran signed a historic peace agreement on June 17.
Iran cited continuing Israeli strikes in Lebanon as ceasefire violations justifying the renewed closure, which had originally begun in early March 2026 following a conflict that started on February 28.
Pakistan, which has served as a key mediator throughout the conflict, announced that technical talks between the United States and Iran are scheduled to resume in Geneva on June 21, 2026.
Iran issued new transit regulations requiring all commercial vessels to seek advance permission, pass political vetting, and follow designated routes monitored by Iranian authorities before crossing the Strait.
Iran also imposed transit charges of up to USD 2 million per vessel, a policy the UN Security Council has called the use of a critical waterway as a "bargaining chip."
More than 800 heavy commercial vessels remain stranded on both sides of the Strait as a result of the combined effects of the original closure and the renewed restrictions.

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 broader Indian Ocean. At its narrowest point it is approximately 21 nautical miles wide. It is classified as one of the world's most critical maritime chokepoints because roughly one-fifth of all globally traded seaborne oil — along with significant volumes of liquefied natural gas (LNG), fertilisers, and other commodities — passes through it daily. Between 100 and 140 major vessels transit the Strait on any given day under normal conditions.

Located between Iran to the north and the Sultanate of Oman to the south; the Strait's territorial waters are divided exclusively between these two states.
Approximately 20% of global petroleum and 20% of global LNG trade traverse the Strait annually under normal conditions.
Since the conflict began in late February 2026, crude oil transit through the Strait fell by approximately 95% and LNG transit by approximately 99%.

Connection to this news: Iran's leverage to close the Strait derives from the fact that the waterway lies entirely within the territorial waters of Iran and Oman, giving Iran physical and legal capacity to restrict passage despite international objections.

Transit Passage Rights Under International Law (UNCLOS)

Under the United Nations Convention on the Law of the Sea (UNCLOS), international straits that connect two parts of the high seas or exclusive economic zones enjoy a special regime called "transit passage." This regime grants all ships and aircraft the right of free, continuous, and unobstructed passage through such straits, regardless of whether the coastal state consents. The transit passage regime is considered part of customary international law, binding on all states whether or not they have ratified UNCLOS.

UNCLOS has been ratified by 171 countries and the European Union; however, Iran signed UNCLOS in 1982 but has not ratified it, in part because it disputes the transit passage article.
The United States has neither signed nor ratified UNCLOS, yet relies on the customary international law status of transit passage to assert freedom of navigation.
Iran's position holds that the Strait falls within its territorial sovereignty and that it may impose conditions on passage, a view not broadly accepted under international law.
The UN Security Council held an emergency session condemning the use of the Strait as a "bargaining chip" and calling for the immediate restoration of freedom of navigation.

Connection to this news: The legal dispute over whether Iran may condition or restrict passage is at the centre of the ongoing diplomatic impasse. The transit charges and vetting requirements Iran has imposed directly contradict the transit passage doctrine.

Pakistan's Role as Mediator and the Ceasefire Architecture

Pakistan emerged as the principal diplomatic mediator in the 2026 US-Iran conflict. Prime Minister Shehbaz Sharif played a key role in brokering the ceasefire announced in early April 2026 and in facilitating the memorandum of understanding announced on June 14 and signed on June 17. Pakistan's mediating role reflects its positioning as a Muslim-majority nuclear state with functional diplomatic relationships across both the Western bloc and the broader Islamic world.

The ceasefire signed April 7–8, 2026, between the United States and Iran included Israel.
Key agenda items in the talks include freedom of navigation through the Strait, Iran's nuclear and ballistic missile programme, reconstruction, sanctions relief, and a long-term peace agreement.
Technical talks were scheduled to resume in Geneva on June 21, 2026, hosted through Pakistani diplomatic channels.

Connection to this news: Iran's re-closure of the Strait within 48 hours of signing the peace agreement, justified as a response to Israeli actions in Lebanon, tests the durability of the ceasefire and Pakistan's mediation architecture at a critical moment.

West Asia as a Flashpoint: Conflict Escalation Dynamics

The 2026 conflict originated on February 28, when the United States and Israel conducted strikes against Iranian nuclear and ballistic missile infrastructure, framing the operation as aimed at preventing nuclear proliferation and inducing structural change in the Iranian government. The conflict rapidly escalated into a sustained exchange involving Iranian naval activity in the Gulf, strikes on Gulf state energy infrastructure, and Iranian closure of the Strait. The death of Iranian Supreme Leader Ali Khamenei in the strikes triggered a succession crisis that complicated diplomacy further.

Iran's initial closure of the Strait was declared on March 4, 2026, three days after the opening strikes.
The conflict produced the largest disruption to global seaborne energy trade since the 1973 oil embargo.
Over 800 commercial vessels were stranded on each side of the Strait at the height of the closure, creating cascading supply chain crises across oil, LNG, fertilisers, and dry bulk.

Connection to this news: Israel's continued strikes in Lebanon — which Iran frames as ceasefire violations by the US-led bloc — provided the stated justification for Iran's June 20 re-closure, illustrating how sub-conflicts in the broader West Asian theatre can directly trigger global trade disruptions.

Key Facts & Data

The Strait of Hormuz is 21 nautical miles wide at its narrowest and lies within the territorial waters of Iran and Oman.
Approximately 20% of global seaborne petroleum and 20% of global LNG trade pass through the Strait under normal conditions.
Iran's transit fees reached up to USD 2 million per vessel under the new June 2026 regulations.
More than 800 heavy commercial vessels remained stranded on each side of the Strait as of June 20, 2026.
UNCLOS has been ratified by 171 countries; Iran signed it in 1982 but has not ratified it due to disputes over the transit passage provision.
Pakistan brokered the US-Iran ceasefire signed April 7–8, 2026, and the peace MOU signed June 17, 2026.
Technical talks were scheduled to resume in Geneva on June 21, 2026.