President Donald Trump declared the ceasefire between the United States and Iran to be on 'massive life support' on Sunday after dismissing Tehran's latest response to a 14-point American peace proposal as 'totally unacceptable,' plunging negotiations into their most acute crisis since the monthlong pause in fighting took hold and raising the prospect of resumed US military strikes.
The conflict began in late February 2026, when the United States launched a series of strikes on Iranian nuclear and military infrastructure. Over 73 days of fighting, the exchange escalated to include Iranian missile attacks on US naval assets and, on Day 66, strikes on facilities in the United Arab Emirates — a crossing of a threshold that drew sharp responses from Gulf Arab states and alarmed international oil markets. A ceasefire took effect approximately a month into the conflict and has remained formally in place, though both sides have continued to exchange fire in the Strait of Hormuz since the pause was announced.
Pakistan has been serving as mediator between Washington and Tehran, with negotiations covering a broad agenda: freedom of navigation through the Strait of Hormuz, Iran's nuclear programme and ballistic missile capabilities, sanctions relief and reconstruction funding, and the terms of any long-term political agreement. Iran's government submitted its response to the US proposal via the Pakistani intermediary on Sunday. Trump, reviewing the document, concluded it failed to include the nuclear concessions he had made central to any deal and declared the offer unacceptable within hours of receiving it. The White House subsequently announced a new round of sanctions against Tehran.
Trump told reporters the ceasefire remained technically in effect but was 'on massive life support.' Iranian officials, in a separate statement issued through state media, described the US 14-point proposal as a 'demand for surrender' that sought through diplomacy what the United States had failed to achieve on the battlefield. Iran's government said it remained ready to repel any resumed American attack. Pakistan said it was continuing its mediation and was attempting to arrange a memorandum of understanding as a bridge between the two sides, with diplomatic sources saying a revised proposal could be submitted within days.
European governments called on both parties to return to the negotiating table without preconditions. The United Kingdom's foreign secretary said London was gravely concerned about the risk of renewed hostilities. China urged restraint and reiterated its call for a negotiated settlement. Elsewhere in the region, Israeli strikes and continued Hezbollah attacks fuelled fears that a separately declared Lebanon ceasefire was also unravelling, adding another dimension of instability to an already volatile picture.
The Strait of Hormuz remains the most immediate flashpoint. Trump said when the ceasefire was first announced that the pause in US strikes was conditional on the complete and immediate reopening of the strait, through which approximately 20% of the world's traded oil passes. Iran has described any US counter-blockade of Iranian waters as a potential ceasefire violation. Shipping insurance premiums for transit through the strait have remained at elevated levels throughout the ceasefire period, and several major tanker operators continue to avoid the route, rerouting cargo around the Cape of Good Hope at significantly higher cost.
The Trump administration said it would convene a meeting of senior military commanders in the coming days to review its options. It has not ruled out resuming strikes. Iran has said it will not make nuclear concessions under military pressure and accused Washington of bad faith. Diplomatic sources close to the mediation said Pakistan was under pressure from both American and Iranian officials to deliver a workable compromise before the ceasefire collapses entirely.
