The discussions, held days after a Pakistan-brokered ceasefire, marked the first direct engagement between senior U.S. and Iranian officials since Iran’s 1979 Islamic Revolution. Delegations led by U.S. Vice President JD Vance and Iranian Parliament Speaker Mohammad Bagher Qalibaf met over more than 20 hours at Islamabad’s Serena Hotel, with Pakistani mediators shuttling between the sides.

Despite moments when negotiators appeared close to a framework agreement, talks ultimately stalled over key issues including Iran’s nuclear program, control of the Strait of Hormuz, and access to frozen assets, according to 11 sources familiar with the discussions.

A U.S. official said Washington’s core objective remained ensuring Iran does not obtain a nuclear weapon, while Iranian officials emphasized sovereignty concerns, sanctions relief, and broader security guarantees.

Iran has consistently denied seeking nuclear weapons but maintains its right to uranium enrichment.Sources described a tense and shifting atmosphere, with periods of optimism giving way to deadlock. At one stage, the sides were “80 percent” toward an understanding before unresolved political decisions derailed progress, one source said.

Pakistan played a central mediating role, with Prime Minister Shehbaz Sharif confirming that efforts to bridge differences are ongoing. Officials said communication between Tehran and Washington continues through intermediaries, even after the formal talks ended.

U.S. President Donald Trump said on Monday that Iran had reached out seeking a deal, though this could not be independently verified. A White House spokesperson reiterated that Washington’s position remains unchanged, particularly its demand that Iran abandon any pathway to nuclear weapons.

Iranian officials signaled deep mistrust, citing past negotiations and subsequent military actions, while also indicating willingness to continue discussions under defined conditions.The Strait of Hormuz remains a central point of contention, with Iran asserting control over the waterway and the United States insisting on restoring unrestricted navigation.

The dispute has had significant implications for global energy markets, contributing to volatility and supply concerns.Mediators, including Pakistani officials and regional diplomats, have continued backchannel communications in an effort to revive talks.

Both sides face mounting pressure to de-escalate, with economic costs rising and broader geopolitical risks intensifying.