By Humeyra Pamuk, Jana Choukeir, Ahmed Tolba and Steve HollandZURICH/DUBAI/WASHINGTON, June 21 (Reuters) - Negotiators from the United States and Iran were set to start peace talks in Switzerland on Sunday, even as U.S. officials disputed Iranian claims about closing the key Strait of Hormuz.A high-level Iranian team arrived in Switzerland for peace talks with the U.S., Iranian state media reported, as U.S. Vice President JD Vance departed Washington for meetings that Pakistan said will begin on Sunday.

Iran to Send Delegation to Switzerland to Follow Up on U.S.-Iran Agreement, State Media Reports. Vance Says U.S. Officials on Ground for Iran Talks; No Evidence Tehran Is Closing…

US and Iranian officials are still expected to meet in Switzerland on Sunday, but Saturday's events point towards a likely major shift in the agenda for the first round of talks.