US Marines fired on the engine room of the Iranian tanker Tosca and seized it - the first physical enforcement of Washington’s Hormuz blockade. The move shattered a fragile understanding brokered by Pakistan, which had expected President Trump to lift the blockade in exchange for renewed talks. Instead, the US escalated.
Iran responded by firing on and seizing three container ships, including the NSC Francesca and the Epimenides. According to Jeremy Scahill on Breaking Points, Tehran viewed Trump’s continuation of the blockade as a betrayal of the Pakistani-mediated deal. The IRGC, now in full control of maritime enforcement, sees the US presence as an illegal incursion into sovereign waters.
"The deal collapsed because Trump extended the ceasefire but kept the blockade. Iran wasn’t playing games - they were negotiating in good faith until that moment."
- Jeremy Scahill, Breaking Points
Greg Karlstrom of The Economist notes that Iran’s foreign minister had only signaled conditional openness - subject to IRGC coordination and potential tolls - not a full reopening. Markets misread the signal, and oil prices swung wildly: down on false hope, then up $10 a barrel when the boarding became public.
Talks in Islamabad remain scheduled, with Vice President J.D. Vance leading the US delegation. But Iran now insists the blockade must lift before it attends. The US, in turn, demands a long-term freeze on uranium enrichment - a gap Robert Pape of the University of Chicago calls “structural,” not tactical. This isn’t miscalculation; it’s a clash over power.
"The United States has lost the illusion of control. We’re not managing this conflict - we’re in a structural collision with Iran over nuclear rights and maritime sovereignty."
- Robert Pape, Breaking Points
Trump claims Iran loses $500 million daily when the Strait closes - implying Tehran wants it open. But the IRGC’s swift retaliation suggests otherwise. For them, sovereignty trumps revenue. The window for diplomacy narrows with every seized ship.

