Iran's foreign ministry spokesperson Esmaeil Baghaei said the Iranian delegation refused to continue quadrilateral talks involving the United States, Pakistan and Qatar in Switzerland after what he described as a "threatening statement" by US President Donald Trump during the negotiations.

Speaking to Iranian media, Baghaei said Qatar and Pakistan attempted to keep the four-party format in place, but Tehran rejected the proposal.

"Qatar and Pakistan tried to continue the talks, and we said it would not be a quadrilateral meeting," he said.

Baghaei added that the Iranian delegation's priority remained ensuring that commitments already agreed upon were implemented, stating: "The Iranian delegation's view is that we must force the other side to implement its commitments."