Iran on June 28 suspended peace negotiations with the United States and threatened to "completely block" both the Strait of Hormuz and the Bab-el-Mandeb strait. The move came 11 days after Trump and Iranian President Pezeshkian signed a ceasefire memorandum of understanding at Versailles on June 17. Iran had already reimposed PGSA toll requirements on June 21. The IRGC simultaneously ordered commercial vessels to use only Tehran-approved Hormuz transit routes. Roughly 20% of global crude oil transits Hormuz daily.
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Ceasefire Reversal Playbook
The Trump-Iran MOU set a 60-day clock for a final deal. Iran signed June 17, then within four days reimposed PGSA clearance requirements on vessels. The U.S. had already lifted its naval blockade on Iranian ports as part of the MOU's terms — Iran captured the concession first, then stalled. The IRGC's routing orders delegate traffic control of global shipping to Tehran while talks nominally continue.
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Shipping Disruption Data
Windward tracked 151 Hormuz transits June 1–15, versus 156 transits across all of May, with 18% of June transits operating dark (AIS off). Separately, Lebanon inaugurated the René Mouawad Airport on June 28, while France and Italy announced a multinational coalition to replace UNIFIL after its mandate ends December 31, 2026, aiming to bolster Lebanese armed forces as buffer against Hezbollah.
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Bab-el-Mandeb Second Front
The Bab-el-Mandeb threat adds a second chokepoint handling roughly 10% of global trade. If Tehran blocks both straits simultaneously, the only bypass is the Cape of Good Hope — adding 9–14 days of transit and sharply higher freight costs. Houthi forces in Yemen retain shore-launched missile capability across the strait even after U.S. strikes earlier in 2026, giving Iran a forward proxy it did not have to deploy itself.
Iran turned an eleven-day-old ceasefire into new leverage. The 60-day clock is still ticking.
Sources
- ✓ Wikipedia — Portal:Current events/June 2026 — June 28 2026
- ✓ Al Jazeera — IRGC warns against new Hormuz route for ships — June 25 2026
- ✓ NPR — U.S. lifts blockade on Iranian ports as 60-day clock starts — June 18 2026
- ✓ Crisis Group — Strait of Hormuz Trigger List — June 2026
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