Dhaka, June 21 -- Peace talks led by US Vice President JD Vance and Iranian chief negotiator Mohammad Baqer Qalibaf were set to begin on Sunday morning at a Swiss mountaintop resort as both nations seek a durable end to their war while disagreeing over Iran's claim that it had closed the vital Strait of Hormuz.

The US and Iran had agreed to a 60-day ceasefire for the negotiations, but Tehran's Islamic Revolutionary Guard Corps on Saturday declared the Strait of Hormuz shut in response to Israeli strikes in Lebanon, although the US military said commercial vessels kept operating.

Those developments could complicate the talks in which both sides want to advance an interim deal brokered by Pakistan and signed on Wednesday by Presidents Don...