The brief ceasefire is over. The diplomacy has failed. And the United States Navy is now enforcing a blockade of the Strait of Hormuz.

President Trump announced Sunday that nearly 20 hours of marathon peace negotiations between the United States and Iran — facilitated by Pakistani leaders in Islamabad — had ended without agreement. Iran refused to meet the core U.S. demand: the complete surrender of its nuclear ambitions. Within hours, Trump ordered the most consequential naval action of the conflict, directing the U.S. Navy to begin blocking all ships attempting to enter or leave the strait on Iran’s behalf.

“IRAN WILL NEVER HAVE A NUCLEAR WEAPON!” Trump declared in his Truth Social announcement, framing the blockade not merely as economic pressure but as the irreducible endpoint of America’s strategic goal.

Vice President JD Vance confirmed the outcome from Islamabad: “We are leaving without a deal. This is bad news for Iran.” Israeli officials, briefed in advance on the U.S. decision to impose a blockade, said they were “not surprised” and expressed support for Washington’s position that “no deal is better than a bad deal.”

Trump described the policy in a Fox News interview as “all or nothing” — drawing a comparison to past enforcement action against Venezuela, but “at a higher level.” The blockade does not close the strait to all nations; it specifically targets Iranian-linked maritime traffic and vessels that have paid what Trump called “illegal tolls” to Tehran.

Trump also blamed Iran for the strait’s effective shutdown, accusing Tehran of deploying or threatening naval mines without specifying their locations — creating commercial uncertainty that has halted much of the shipping traffic without Iran needing to physically stop every vessel. “What ship owner would want to take the chance?” he said.

As the blockade took effect, Israel moved to a heightened state of military readiness — the most significant posture shift since the conflict’s earliest weeks.

Israeli officials told domestic media that structured battle procedures — similar to those employed ahead of Operations Rising Lion and Roaring Lion — have been reactivated, shortening response times across air, land, and naval forces. No final strike decision has been made. But the IDF is, by its own account, actively preparing for multiple scenarios, including the possibility of an Iranian first strike prompted by the naval blockade.

Military coordination between Israel and U.S. Central Command remains ongoing. Senior officials confirm any major military action would be coordinated at the highest levels between Washington and Jerusalem.

Despite the escalation, Trump expressed a measure of residual optimism — suggesting he expects Iran may yet return to the negotiating table under the economic pressure of a naval blockade that cuts off its primary oil export route. “The goal remains a system where all are being allowed to go in, all being allowed to go out,” he said. But he made clear that for now, that goal depends entirely on Iran’s willingness to do what it has refused to do for weeks: give up its nuclear program.

Markets are in turmoil. Tehran has warned of a “severe response” to U.S. warships approaching its coastal zones. The Strait of Hormuz — through which one-fifth of the world’s oil supply passes — is once again the fulcrum on which the stability of the global energy system rests.

The ceasefire lasted five days. The diplomacy lasted 20 hours. What comes next may be measured in minutes.

FFN is providing continuous coverage of the Strait of Hormuz blockade and its global implications at fandfnews.com. Situation fluid and rapidly developing. All figures and official quotes sourced from CENTCOM, White House, Israeli government channels, and wires as of April 13, 2026.