Iran said the Strait of Hormuz was “completely open” to commercial vessels during a temporary ceasefire announced Friday, though U.S. warships continued blocking ships tied to Iranian ports.
Iranian Foreign Minister Abbas Araqchi said Friday in a post on X that vessels could again transit the strait along coordinated routes during the ceasefire, a move aimed at easing pressure on a corridor that carries roughly 20% of the world’s oil. But U.S. forces continued turning back ships tied to Iranian ports under an active blockade, creating a split reality in the narrow waterway.
U.S. officials have framed the operation as a targeted effort to choke off Iran’s maritime trade without fully closing the strait, with warships and aircraft warning vessels to turn back or face boarding as enforcement ramps up across the region.
Military.com reached out for comment to the White House, Defense Department, U.S. Central Command and the Air Force.
Open — But Still Under Pressure
Iranian officials said vessels must follow designated transit routes and, in some cases, coordinate passage with the Islamic Revolutionary Guard Corps—a requirement that places one of the world’s busiest shipping lanes under Iranian oversight and raises new questions about freedom of navigation.
The International Maritime Organization said it was working to verify whether the reopening complies with international law and freedom of navigation standards, adding uncertainty over how the arrangement will function in practice.
Military vessels remained barred, and it remained unclear how Iran’s rules would be enforced alongside an ongoing U.S. naval blockade targeting Iran-linked traffic.
Shipping behavior began shifting almost immediately. Some operators resumed transit under tighter controls, while others delayed departures, rerouted cargo or held vessels outside the strait as they assessed risk. German shipping company Hapag-Lloyd said it was continuing to avoid the strait while monitoring conditions.
The result is a corridor that is no longer shut down but far from fully restored, constrained by competing military pressure, political control and uncertainty at sea.
US Still Blocking Iran Shipping
American warships, aircraft and more than 10,000 personnel continued enforcing restrictions on vessels tied to Iranian ports, warning ships off, redirecting traffic and limiting movement through the region even as broader commercial transit began to resume.
The blockade began after high-level talks between Washington and Tehran collapsed, triggering a rapid escalation that included naval deployments and expanded enforcement targeting vessels entering and leaving Iranian ports.
At least 14 vessels reversed course within 72 hours of enforcement, according to shipping data cited by Reuters, underscoring how aggressively U.S. forces were policing the waterway.
Officials framed the effort as a targeted blockade, not a full closure, allowing non-Iran-bound traffic to continue moving through the strait.
President Donald Trump said Friday that the blockade on Iranian-linked shipping would remain “in full force” even as commercial transit resumed more broadly.
Shipping companies adjusted in real time. Some vessels resumed transit under tighter security, while others delayed voyages, rerouted cargo or held outside the strait amid rising insurance costs and uncertainty over how far enforcement would go.
Markets Jolt as Shipping Shifts
Markets swung sharply following Iran’s announcement.
Oil prices, which surged above $100 per barrel earlier in the crisis, fell about 13% Friday as traders reacted to the prospect of resumed flows through the strait, easing fears of a prolonged supply shock.
But the pullback reflected easing fears, not stability.
Shipping behavior remained cautious as the U.S. blockade and Iran’s reopening collided in real time. Some tankers resumed transit under tighter conditions, while others delayed departures, rerouted cargo or held outside the strait amid uncertainty over enforcement, security risks and Iran’s routing requirements.
Insurers warned of elevated risk across the region, with premiums rising and coverage tightening as companies weighed the possibility of disruption or escalation.
Near Shutdown — Now Back Open (For Now)
The strait had been pushed close to a standstill in recent weeks as tensions surged and Iran moved to tighten control over the waterway.
Earlier in the conflict, officials warned that reopening the strait would be complex and dangerous, with mines, military threats and contested waters making any return to normal shipping slow and uncertain.
Shipping traffic fell sharply during the height of the crisis, with vessels delaying departures, rerouting cargo or holding outside the strait as the risk of disruption grew.
The U.S. responded by launching mine-clearing operations to secure safe passage and, after nuclear and maritime talks collapsed, escalated further with a naval blockade targeting vessels tied to Iranian ports.
That rapid escalation sent shockwaves through global energy markets and raised fears that one of the world’s most critical oil routes could be cut off.
Warships Face Off in Hormuz
U.S. and Iranian forces continued operating in close proximity in and around the Strait of Hormuz, where American warships enforcing a blockade maneuvered alongside Iranian fast-attack craft and patrol boats that routinely shadow vessels in the area.
The buildup follows weeks of increasing U.S. military presence in the region, including deployments of Marines and naval assets as tensions escalated and attacks on commercial shipping intensified.
That environment left little margin for error. Routine encounters, including radio warnings, course changes or aggressive maneuvers by smaller boats, could be misread in seconds and escalate quickly into confrontation.
The tension is compounded by competing missions unfolding at the same time, with U.S. forces restricting Iranian-linked traffic while Iran asserts control over transit routes during the ceasefire.
For now, the waterway remains open but volatile, with global energy flows moving through a corridor where the next incident could quickly reignite the crisis.
