U.S. President Donald Trump said that American negotiators will be in Pakistan on Monday for talks with Iran.Vice President JD Vance and envoys Steve Witkoff and Jared Kushner will be traveling to Islamabad for the talks, accord ing to the White House.In a social media post Sunday, Trump accused Iran of violating the ceasefire agreement by firing bullets on Saturday in the Strait of Hormuz and threatened to destroy civilian infrastructure in Iran if it doesn't take the deal that the U.S. is offering.If they dont, the United States is going to knock out every single Power Plant, and every single Bridge, in Iran, Trump wrote.But Iran is not yet ready to hold a new round of face-to-face talks with U.S. officials, a senior Iranian official said Saturday, citing Washington's refusal to abandon maximalist demands on key issues.In an interview with The Associated Press on the margins of a diplomacy forum in Turkey, Iranian Deputy Foreign Minister Saeed Khatibzadeh also said his country will not hand over its enriched uranium to the United States, rejecting claims made by President Trump.I can tell you that no enriched material is going to be shipped to United States, Khatibzadeh said. This is non-starter and I can assure you that while we are ready to address any concerns that we do have, were not going to accept things that are nonstarters.RELATED NEWS | Iran fires on tanker as it reimposes Strait of Hormuz restrictionsIran doubled down on its pledge to restrict ships passing through the Strait of Hormuz as long as the U.S. blockade of Iranian ports remains in place, as mediators scrambled to extend the ceasefire set to expire on Wednesday.The dueling blockades have complicated Pakistani-led mediation attempts and raised questions about whether the two-week truce can be extended.It is impossible for others to pass through the Strait of Hormuz while we cannot, Iranian parliamentary Speaker Mohammed Bagher Qalibaf said in an interview aired on state television late Saturday.Qalibaf, who is Iran's chief negotiator in talks with the United States, slammed the U.S. blockade as a naive decision made out of ignorance." He said before Trump's latest comments that Iran still was seeking peace despite deep-seated distrust of the United States.There will be no retreat in the field of diplomacy," he said, acknowledging that the gap between the two sides remained wide.Iran had announced the straits reopening after a 10-day truce between Israel and the Iranian-backed Hezbollah militant group in Lebanon took hold on Friday. But after Trump said that the U.S. blockade of Irans ports will remain in full force until Tehran reaches a deal with the United States, Iran said it would continue enforcing its restrictions in the strait.After a brief uptick in transit attempts on Saturday, vessels in the Persian Gulf held their positions, wary after two India-flagged ships were fired on mid-transit and forced to turn around. Their retreat returned the strait, through which roughly one-fifth of the worlds oil trade normally passes, to its pre-ceasefire status quo, threatening to deepen the global energy crisis and push the parties toward renewed conflict as the war entered its eighth week.With days until the ceasefire in place between the U.S. and Iran runs out, Iran on Saturday said it had received new proposals from the United States, and Pakistani mediators were working to arrange another round of direct negotiations in the coming days.Pakistani authorities began tightening security in the capital, Islamabad. A regional official involved in the mediation efforts said mediators were finalizing the preparations and that U.S. advance security teams were already on the ground. The official spoke on condition of anonymity because they weren't authorized to discuss the preparations with the media.For Iran, the straits closure imposed after the U.S. and Israel launched the war on Feb. 28 during talks over Tehrans nuclear program is perhaps its most powerful weapon, threatening the world economy and inflicting political pain on Trump. For the United States, the blockade squeezes Irans already weakened economy and pressures its government by denying it long-term cash flow.Though the ceasefire has held, the standoff in the strait threatens to plunge the region back into a war that has killed at least 3,000 people in Iran, more than 2,290 in Lebanon, 23 in Israel and more than a dozen in Gulf Arab states. Fifteen Israeli soldiers in Lebanon and 13 U.S. service members throughout the region have been killed.MORE FROM IRAN | IMF warns global economy could stall as Iran war disrupts oil flowsReopening hopes sink as ships come under fireRevolutionary Guard gunboats opened fire on a tanker and a projectile hit a container vessel, damaging some containers, the British militarys United Kingdom Maritime Trade Operations center said. Indias Foreign Ministry said it summoned Irans ambassador over the serious incident of firing on two India-flagged merchant ships, especially after Iran earlier let several India-bound ships through.Americans are risking the international community, risking the global economy through these, I can say, miscalculations, Iranian Deputy Foreign Minister Saeed Khatibzadeh told The Associated Press, adding that the U.S. is risking the whole ceasefire package.Irans Supreme National Security Council issued a statement calling the blockade a violation of the ceasefire and said Iran would prevent any conditional and limited reopening of the strait. The council has recently acted as Irans de facto top decision-making body.Since most supplies to U.S. military bases in the Gulf region come through the strait, Iran is determined to maintain oversight and control over traffic through the strait until the war fully ends, the council said. That means Iran-designated routes, payment of fees and issuance of transit certificates.Pakistan pushes for progress toward a new dealThe renewed standoff over the strait came hours after Pakistani Foreign Minister Ishaq Dar said his country was working to bridge differences between the U.S. and Iran.Before Trump's latest post on Sunday, Irans Supreme National Security Council said new proposals from the U.S. had been put forward during a visit to Iran by Pakistans army chief and were being reviewed.Khatibzadeh said that Iran will not hand over its stock of 970 pounds of enriched uranium to the United States, calling the idea a nonstarter. Khatibzadeh didn't address other proposals for the enriched uranium, saying only that we are ready to address any concerns. ...read more read less