More than twenty hours of direct negotiations between the United States and Iran ended without a deal in Islamabad on Sunday, leaving a fragile two-week ceasefire as the only barrier between diplomacy and a return to open conflict. Pakistan, which had spent weeks engineering the historic talks — the highest-level direct engagement between Washington and Tehran since Iran's 1979 Islamic Revolution — now faces the harder task of preventing the process from unravelling entirely.

Pakistani Prime Minister Shehbaz Sharif described the encounter as a "historic moment", telling his federal cabinet on Monday that "full efforts" remained underway to resolve outstanding issues. "Today, the ceasefire still stands," he said. Deputy Prime Minister and Foreign Minister Ishaq Dar pledged that Pakistan would "continue to play its role to facilitate engagements and dialogue" in the days ahead. Analysts in Islamabad were careful to frame the outcome as a pause rather than a failure, with one former Pakistani naval commodore and diplomat noting that "the mere fact of bringing both parties face to face is a significant diplomatic achievement in itself."

The talks broke down over six core disputes: Iran's uranium enrichment programme and its stockpile of highly enriched uranium; the dismantling of major enrichment facilities; a broader regional security framework involving US allies; Tehran's financial support for groups Washington designates as terrorist organisations, including Hamas, Hezbollah and the Houthis; and the status of the Strait of Hormuz — the narrow waterway through which roughly 20 percent of global oil supplies pass. Iran has effectively controlled access to the strait since US-Israeli strikes began on February 28, imposing what analysts describe as a de facto toll system that has pushed oil prices above $100 per barrel. US Vice President JD Vance, who led the American delegation alongside special envoy Steve Witkoff and presidential son-in-law Jared Kushner, said Washington's demand was straightforward: a binding commitment that Iran would not seek a nuclear weapon or the enrichment capacity to quickly build one. Hours after the talks ended, President Donald Trump announced a US Navy blockade of the strait, framing Iran's toll system as "illegal extortion", while acknowledging that "most points were agreed to" — just not the nuclear question.

Iran's account differed sharply. Foreign Minister Abbas Araghchi said his delegation had negotiated in good faith, only to face "maximalism, shifting goalposts, and blockade". His reference to an "Islamabad MoU" — a memorandum of understanding that reportedly came close to being signed — suggested the two sides had reached further than either government had publicly admitted. Iran's Parliament Speaker Mohammad Bagher Ghalibaf, who led the Iranian delegation, said mistrust rooted in the experience of two wars made agreement impossible. Tehran's ambassador to Pakistan offered a more measured note, writing that the talks represented "a process" and "laid the foundation for a diplomatic framework" if trust could be rebuilt.

Why this matters: the breakdown comes at a moment of acute global economic strain, with oil market disruption rippling from Asia to Europe and US domestic support for continued military action weakening. Pakistan's ability to keep both parties at the table — without a formal agreement to anchor the process — will determine whether diplomacy retains any traction before the ceasefire expires. Historical precedents cited by Sharif himself, from the Oslo Accords to the Good Friday Agreement, suggest that deals of this complexity rarely emerge from a single round of talks. The narrowness of the window, however, makes each passing day consequential.