The United States and Iran exchanged a fresh round of attacks over navigation in the Strait of Hormuz on Sunday, despite a memorandum of understanding signed by the two countries in June

The flare-up is the latest to undermine an interim agreement between Washington and Tehran aimed at ending their war.

Weekend exchanges in the Middle East threaten to collapse a fragile interim deal aimed at ending the war.

U.S.-Iran tensions soar over Hormuz Strait dispute-