U.S. vice president said Washington hopes to make progress on both the Lebanon ceasefire and Iran’s nuclear program, while Tehran’s threat to close a key oil chokepoint tests Trump’s fragile deal.…

The announcements indicated a rough start to the technical-level talks that key mediator Pakistan said will begin Sunday, with Qatari mediators also participating.

Talks come as Iran says it is closing the Strait of Hormuz over Israel's deadly attacks on Lebanon.