After Islamabad talks collapse, Washington launches a naval blockade on Iran-bound shipping and keeps escalation options open

By Tahani Elghazaly
Published April 12, 2026

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The crisis between Washington and Tehran entered a more dangerous phase after talks in Islamabad ended without a deal, with U.S. Central Command announcing a naval blockade on all vessels heading to or leaving Iranian ports starting Monday, April 13, 2026, at 10:00 a.m. Eastern Time.

The U.S. move stops short of a full closure of the Strait of Hormuz. Washington said ships bound for non-Iranian destinations will still be allowed to transit, but the measure places direct pressure on Iranian trade and energy flows through one of the world’s most sensitive maritime chokepoints.

The escalation came after roughly 21 hours of negotiations that were described as among the highest-level direct contacts between the two sides in decades. The talks broke down over Iran’s nuclear program, enrichment levels, oversight demands and broader regional issues. Washington said Tehran refused key terms, while Iran accused the U.S. of overreach.

Markets reacted immediately. Oil prices jumped more than 7 percent, with Brent rising to $101.91 a barrel and U.S. crude to $104.16, reflecting fears of supply disruption through the Gulf and the Strait of Hormuz.

Alongside the blockade, signs are growing that the U.S. administration is keeping the option of limited strikes under consideration, though no new military action has been officially announced so far. Reports in the U.S. press pointed to discussions of that option after the talks collapsed, while the only confirmed move at this stage remains the maritime blockade.

The result is a strategy that appears designed to shift from diplomatic pressure to calibrated maritime and military pressure without moving immediately into full-scale war. But the sensitivity of Gulf shipping lanes and their link to global energy markets means any further escalation could widen the crisis quickly.