Iran says the Strait of Hormuz is fully open to commercial vessels. But President Donald Trump says the American blockade on Iranian ships and ports will stay in force until Tehran reaches a deal with the U.

Trump soon blasted Iran's response as "totally unacceptable."

Iran’s grip on the Strait of Hormuz has jolted the world economy, causing a spike in fuel prices that has rippled through other sectors with effects far beyond the Middle East. It has also left tens of thousands of mariners and hundreds of ships stranded in the Persian Gulf.

The U.S. military said it battled Iranian forces and sank six small boats as it moved to reopen the Strait of Hormuz on Monday. The United Arab Emirates, a key American ally, said it had come under attack from Iran for the first time since a fragile ceasefire took hold in early April.

The Trump administration’s approach to the Iran war over the past 24 hours has pinballed from declarations that a tenuous ceasefire was holding and military operations were over to new threats of bombing the Islamic Republic.

China’s top diplomat also warned against the restarting of hostilities as he met with Iran’s foreign minister. The U.S. has urged China to pressure Iran to reopen the waterway.

Iran gave President Trump a one-month deadline to permanently end the war and open the Strait of Hormuz, where a carrier was attacked on Sunday.

Qatar and Türkiye support Pakistan’s mediation efforts aimed at ending the Iran war and reopening the Strait of Hormuz, the Qatari foreign minister said on Tuesday.