Pakistan's Chief of Defence Forces Field Marshal Asim Munir held talks in Tehran on Monday with Iranian President Masoud Pezeshkian and senior security officials, seeking to revive the diplomatic framework for ending the US-Iran conflict after a Pakistan-brokered 60-day ceasefire expired in mid-August without renewal. Iranian leaders reiterated that Washington must be the first to act, with parliament speaker Bagher Ghalibaf saying the US must honour commitments under the Islamabad Memorandum of Understanding (an agreement Pakistan helped broker in June following a war that began in February with US-Israeli strikes on Iran), while security chief Mohsen Rezaei stated bluntly that "America must change its behaviour." The visit, which produced no new agreement but was described by Pakistani officials in cautiously optimistic terms, comes as Washington simultaneously announced what US Treasury Secretary Scott Bessent called "the harshest sanctions in history" against Iran, and as Oman's foreign minister arrived in Tehran on Tuesday for separate talks on reopening the Strait of Hormuz — the waterway at the centre of the standoff — where shipping traffic remains roughly 90 percent below pre-war levels.