Iran dealt two quick blows to the interim agreement with the United States on Saturday, angered by Israel’s continued attacks in Lebanon, saying it had closed the Strait of Hormuz and announcing that while its negotiators were going to Switzerland for talks, not much is likely to happen there.

Key mediator Pakistan, meanwhile, said the technical-level talks will begin on Sunday in Bürgenstock, Switzerland, with Qatari mediators also taking part.

In Tehran’s first salvo, Iran’s joint military command said the strait had been closed, citing the Israeli attacks and US “bad faith” and “clear breach of its commitments” by failing to end the war. Its statement on state television warned that “if the aggression continues, subsequent steps have been planned”.

Shortly after that, the state broadcaster announced that Iran’s negotiating team was going to Switzerland, a trip that had been originally planned for Friday. State media said the team includes parliamentary Speaker Mohammad Bagher Qalibaf, Foreign Minister Abbas Araghchi and central bank and oil officials, among others.

Foreign Ministry spokesperson Esmail Bagahei, however, signalled that little might happen until Iran feels the US is living up to the deal.