Oman, a longtime U.S. ally and Iran mediator, faced Trump administration pressure after discussing partnering with Iran on Strait of Hormuz fees, drawing threats and regional criticism amid ongoing Middle East tensions.
Iran's president apologizes as missiles hit neighboring countries, sparking Gulf state concerns.
Kuwait, a key U.S. ally hosting American military bases, suffered over a dozen attacks from Iran since April, with a June 3 barrage killing one and injuring 60 at its airport, amid escalating U.S.-Iran tensions.
The Iran war has highlighted the U.S. troop presence in Saudi Arabia. The kingdom has faced hundreds of Iranian missile and drone attacks.