Iran reclosed the Strait of Hormuz after renewed Israeli strikes in southern Lebanon with the move announced as negotiations between the United States and Iran shifted to Switzerland. Tehran’s warning came alongside plans for technical talks in Burgenstock, where delegations prepared to revisit a recently signed memorandum intended to halt hostilities across the region.
The development matters because the strait is an energy chokepoint for roughly a fifth of global oil flows, and the closure risks disrupting shipments just as a fragile ceasefire between Israel and Hezbollah showed signs of strain. Officials on all sides framed the steps as leverage over a 60-day path to a final accord, while regional mediators sought to keep a diplomatic track alive. Last updated: 22 June 2026.
Closure order and implications for the Strait of Hormuz
The Islamic Revolutionary Guard Corps Navy warned, “Do not approach the Strait of Hormuz; otherwise, your security will be jeopardized,” after reimposing restrictions it had lifted under an interim understanding with Washington. The earlier 14-point memorandum envisaged reopening the waterway to commercial vessels and easing US sanctions, but Iranian commanders said continued strikes in Lebanon violated the terms. US Central Command said safe passage “remained intact” and described higher commercial traffic on Saturday, though it was not immediately clear if that reflected conditions before or after Tehran’s latest announcement.
The strait normally handles some 20 million barrels per day of crude and oil products, a trade valued near $600 billion a year in recent tallies, alongside significant liquefied natural gas volumes. Any prolonged disruption could amplify market volatility and shipping risk premiums even if naval escorts maintain partial flow. Mohammad Mokhber, an adviser to Iran’s supreme leader, said energy would not move “so long as the US-Iran agreement remains only on paper,” underscoring Tehran’s use of maritime control as leverage to enforce a ceasefire track.
Ceasefire strain and reported tolls in southern Lebanon
Hostilities in southern Lebanon persisted despite a ceasefire announced for 16:00 local time on Friday, with Israeli strikes continuing into the weekend. Lebanese civil defence and state media reported at least 32 people killed on Saturday, while on Friday the health ministry said 83 people were killed and 141 wounded. Earlier reports had indicated about two dozen fatalities within 24 hours of the truce’s start, and state media said a family of four died in the town of Barich as strikes hit residential areas.
Hezbollah accused Israel of repeated violations and vowed to defend its territory, while Israeli officials said their operations in Lebanon were separate from their confrontation with Iran. The Lebanese army condemned ongoing attacks as an effort to obstruct stability efforts. The divergence between the declared ceasefire and on-the-ground events fed Tehran’s assertion that the interim deal was not being enforced, which it cited as justification for tightening the strait.
US-Iran memorandum and the 60-day negotiation track
The memorandum of understanding signed earlier in the week called for the immediate and permanent termination of military operations on all fronts, including Lebanon, and set a 60-day window, extendable by mutual consent, It also envisioned reopening the Strait of Hormuz for commercial transit and incrementally removing US sanctions on Iran in tandem with verified steps. Tehran argued Washington had failed to ensure the ceasefire took hold in Lebanon, linking battlefield developments directly to its maritime posture.
US officials warned that continued violence could jeopardize the emerging framework, even as forces remained in the “general area” of Hormuz to uphold navigational security. Vice President JD Vance described the diplomacy as “always a delicate coordination dance” and said he expected to travel to Switzerland “sometime in the next couple of days,” emphasizing firm demands for reciprocal compliance. The balance between pressure and engagement shaped both sides’ public messages as they prepared for talks.
Burgenstock talks, delegations and mediators
Negotiations originally slated for Friday were postponed when Iran held back its delegation, citing the intensity of strikes in Lebanon. Pakistan later announced the talks would commence on Sunday in the Swiss resort of Burgenstock, with Iran dispatching a team led by Parliament Speaker Mohammad Bagher Ghalibaf and Foreign Minister Abbas Araghchi. On the US side, senior envoys Jared Kushner and Steve Witkoff were already on the ground to work through technical elements related to Iran’s nuclear programme and the ceasefire mechanism.
Mediators from Qatar and Pakistan moved to bridge gaps ahead of the meeting, with Qatar’s prime minister holding consultations and Pakistani ministers engaging regional counterparts. Iranian foreign ministry spokesman Esmail Baghaei said Tehran would be “very firm and serious in demanding fulfilment of obligations,” referencing what he called past failures by the US to honor commitments. Iranian officials indicated their initial no-show and the closure of Hormuz were intended to compel compliance on the Lebanon front, while observers in Burgenstock cautioned that the process risked “moving backwards” from the MoU baseline unless strikes subsided.
