The Strait of Hormuz is an Iranian ‘kill box,’ preventing the U.S. Navy from securing it right now

Since the U.S.-Israel war on Iran started two weeks ago, traffic around the Persian Gulf choke point has come to a virtual standstill as the Islamic Revolutionary Guard Corps attacks commercial ships and tankers, keeping 20% of global oil supplies bottled up.

President Donald Trump and administration officials insist the Navy can escort ships, perhaps later this month as airstrikes continue to degrade Iran’s ability to launch missiles and drones.

But the U.S. military has reportedly turned down requests for protection so far. Defense officials told The Wall Street Journal Navy escorts aren’t currently feasible because Iran can still attack ships, adding they won’t happen until the threat of Iranian fire has eased.

Navy officials also told the Journal earlier this week U.S. warships and commercial vessels would face enormous risks, describing the Strait of Hormuz as an Iranian “kill box.” The Pentagon didn’t immediately respond to a request for comment.

During a press briefing on Friday, Joint Chiefs of Staff Chairman Gen. Dan Caine acknowledged the threat in the strait while pointing out the military has effectively wiped out Iran’s naval fleet and destroyed its mine-laying ships.

“We’ve made progress, but Iran still has the capability to harm friendly forces and commercial shipping and our work on this effort continues,” he explained.

Caine later said: “It’s a tactically complex environment. Before we want to take anything through there at scale, we want to make sure we do the work pursuant to our current military objectives to do that safely and smartly.”

Despite reports saying Iran has started laying mines, the Pentagon has said there’s no evidence of that yet. But MIT professor Caitlin Talmadge said Iran has thousands of small vessels that could potentially be used to lay mines, adding that they could have been dispersed before the war started.

“Iran has extensive tunnel networks to protect and launch such vessels surreptitiously, including midget submarines and other submersibles useful for mine laying,” she posted on X on Wednesday.

There are also other threats that are potentially even more serious. For example, Iran’s coastal areas offer spots for launching anti-ship missiles, which can be fired from close distances and provide little time for a defensive response.

Iran’s Shahed aerial drones, which have a longer range, can also be launched deeper inland and have been used to damage U.S. military and diplomatic targets around the region as swarms of the low-cost aircraft have overwhelmed defenses in some cases.

And despite losing much of its naval capabilities, the regime still has underwater and surface drones, which were used to attack oil tankers off the coast of Iraq, as well as small fast-attack boats that can threaten much bigger ships.

In fact, an Iranian vessel sailed close to the USS Abraham Lincoln aircraft carrier in the Arabian Sea, prompting an accompanying Navy destroyer to fire its 5-inch cannon, according to CBS News. But it missed multiple times, and a helicopter had to be sent to fire missiles at the Iranian boat.

To be sure, the Navy has long planned for an Iranian blockade of the strait and previously escorted ships through the Persian Gulf in the past during the so-called tanker wars in the late 1980s.

But Iran’s military capabilities weren’t as sophisticated as today’s, and the Navy’s fleet was twice as large. Meanwhile, numerous ships are still carrying out operations in the Caribbean.

In addition, there are more than 300 ships stranded in the Gulf due to Iran’s de facto blockade, and the slower pace required to escort them though the strait means getting all of them out could take months—or even years.

Top commodity analyst Jeff Currie, chief strategy officer at Carlyle Energy Pathways, told The Economist the cost of a single escort would exceed the value of the cargo it trying to protect.