Iran on Monday suspended all negotiations with the United States and threatened to formally close the Strait of Hormuz and activate the Bab el-Mandeb front. Tehran’s negotiating team announced it will halt “the exchange of texts through mediators” indefinitely, citing Israel’s Lebanon offensive as a ceasefire violation.
The trigger was Israel’s expanding Lebanon campaign. Prime Minister Netanyahu ordered the IDF to prepare strikes on Beirut’s Dahieh district, a Hezbollah stronghold housing several hundred thousand civilians. Evacuation warnings were issued Monday morning. An Israeli official told CNN the plans are US-coordinated. Lebanon’s Health Ministry reported 217 killed and 798 wounded in the past 24 hours.
Tehran announced two simultaneous escalations: complete Hormuz closure, hardening from the current “open on paper, shut on water” status that has held since early May, and Bab el-Mandeb activation through its Houthi partners. A combined closure places an estimated $10 billion per day of global trade at risk and blocks ~30% of global container shipping from normal routing.
Oil responded immediately. WTI surged more than 7% to above $94. Brent is trading near $103, erasing a week of deal-optimism decline and moving decisively toward the scenario the morning brief rated 25% probability: framework collapse and Brent snapping to $110-120.
What to watch: Whether Dahieh strikes land before diplomacy can restart; Houthi movements in the Red Sea toward enforcement; Trump’s response to the suspension; and whether the unsigned June 1 MoU survives this rupture.