The IMO’s secretary general told Bloomberg Radio that ships should continue to avoid navigating Hormuz because of the current level of navigational risk.

Trump cited "highly productive conversations with Middle East leadership," following his initial fee proposal the prior day.

In the period between the two cordons, Tehran was able to ship at least 2.2 million barrels a day, a very high level by recent standards.

Trump said that the he would be reinstating a blockade of the strait, and declared that the U.S. should be reimbursed for "providing safety and security" to the waterway.

The deal ends a tense standoff between the two trading partners.

Over the weekend, Iran said the Hormuz strait would now be closed “until further notice.” U.S. Central Command disputed that, saying that waterway was still open to all vessels.

"The new technology doesn't have to cost our members their jobs or put their livelihoods at risk just so a terminal operator can boost profits," the dockworkers' union said.

Shipowners are increasingly having to weigh not only whether to cross, but which route to choose, for fear of angering one side or the other.

The spate of incidents is a reminder of the continued risks to ships crossing through Hormuz, even with military forces protecting vessels crossing by a route near Oman’s coastline.

The U.S. had issued what was supposed to be a 60-day authorization in late June, as part of a tenuous peace agreement with Iran to reopen the Strait of Hormuz.