Pakistani Deputy Prime Minister and Foreign Minister Ishaq Dar has called on Washington and Tehran to honour their ceasefire commitments after marathon face-to-face negotiations concluded in Islamabad without a breakthrough, with US Vice President JD Vance describing the proposal left on the table as America's "final and best offer." The 21-hour talks — the first direct US-Iran engagement of this kind — covered Iran's nuclear programme, sanctions relief, frozen assets, and regional security, but stalled on Tehran's refusal to give binding guarantees that it would never pursue nuclear weapons, while Iran said two to three key issues remained deeply unresolved. Despite the deadlock, Pakistan's mediation role drew rare praise from both sides, with American analysts noting that Islamabad has shifted from a passive go-between to an active peace negotiator at one of the most sensitive diplomatic junctures in recent memory.