Top negotiators from the United States, Iran and Pakistan have arrived in Switzerland ahead of talks that aim to secure the fragile ceasefire and reach a deal on the future of Iran’s nuclear programme.

The US team was led by Vice-President J.D. Vance, who arrived in Burgenstock, the resort hosting the talks on Sunday. He joined special envoy Steve Witkoff and Jared Kushner, President Donald Trump’s son-in-law, who were already on the ground, the Associated Press reported.

Pakistani Prime Minister Shehbaz Sharif and Asim Munir, the chief of the defence forces, who are acting as key mediators, have arrived, Sharif’s office announced on social media.

Iran’s delegation includes Parliamentary Speaker Mohammad Bagher Ghalibaf, Foreign Minister Abbas Araghchi and central bank governor Abdolnaser Hemmati, state-run IRIB News reported.

The talks follow the signing of an interim deal last week, which gave the US and Iran a 60-day window to reach an agreement on the technical details.

But the talks were overshadowed by ongoing fighting in Lebanon between Israel and the Iranian-backed militant group Hezbollah and the subsequent announcement by Iran’s military that it had closed the Strait of Hormuz, a vital waterway for global oil and gas supplies.