Tensions escalated sharply as Iran refused to join fresh talks in Pakistan, demanding the U.S. lift its blockade first. The standoff comes as Donald Trump issued a stark warning, threatening to “knock out” Iran’s power grid if Tehran rejects a proposed deal. Iranian officials said negotiations cannot proceed without trust and reciprocal commitments, highlighting deep divisions over nuclear issues and the Strait of Hormuz. Confusion also gripped Washington over who would attend the talks. With the ceasefire deadline approaching, fears are growing that diplomacy may collapse into another round of conflict.