The United States Navy has intercepted and seized an Iranian-flagged cargo ship, the Touska, in the Gulf of Oman, after what Washington describes as an attempt to breach a US naval blockade. The operation, announced by US president Donald Trump on his social media platform, marks a sharp escalation in an already volatile standoff involving the US, Israel, and Iran.

According to Trump’s account, the nearly 900-foot vessel ignored repeated radio warnings and altered course toward restricted waters. US naval commanders then ordered disabling fire, striking the ship’s engine room and forcing it to a halt. US Marines boarded the Touska and took control without reported casualties. US officials say the ship was already under Treasury sanctions for alleged past involvement in illicit shipments.

Iranian authorities have denounced the seizure as an “act of armed piracy” and a clear breach of the terms of a Pakistan-mediated ceasefire that paused five weeks of intense clashes. The truce, described by diplomats as fragile and narrowly focused on de-escalation at sea and in regional proxy theaters, is now in jeopardy.

A spokesperson for Iran’s military headquarters vowed retaliation, warning that the Armed Forces of the Islamic Republic would respond to what they called an attack on a commercial vessel operating in international waters. Iranian state media has amplified that message, portraying the Touska as a civilian cargo ship targeted for political leverage.

The timing of the incident is particularly sensitive. A US delegation led by Vice-President JD Vance, and including senior advisers Jared Kushner and Steve Witkoff, had been expected in Islamabad for a second round of indirect talks with Iranian representatives under Pakistani auspices. Following the seizure, Iranian outlets have denied that any new talks are scheduled, and officials in Tehran insist they will not return to negotiations while the US blockade remains in force.

The standoff is already reverberating through global markets. With the Strait of Hormuz effectively closed and naval forces from multiple countries on high alert, energy prices have spiked amid fears of supply disruptions. Diplomats warn that without rapid de-escalation, the seizure of the Touska could become the catalyst for a broader confrontation in one of the world’s most strategically vital waterways.