Technical-level US-Iran talks are set to begin Sunday in Bürgenstock, Switzerland, with Pakistan and Qatar serving as mediators and Iranian officials including Speaker Mohammad Bagher Qalibaf and Foreign Minister Abbas Araghchi participating. Iran's joint military command announced closure of the Strait of Hormuz, while Iranian spokesperson Esmail Bagahei stated the trip seeks fulfillment of obligations by the other side. An unverified report mentions diplomats at a Swiss retreat preparing the ground.