‘Turn Around or Be Boarded’: US Blockade Forces Ships Back

The U.S. military is ready to strike Iran “at the push of a button,” Pentagon leaders said Thursday, as a sweeping naval blockade forces ships to turn away from Iranian ports.

The blockade follows failed talks and a fragile ceasefire, with U.S. forces already turning ships away and warning the pressure campaign could quickly escalate into strikes, raising risks for oil flows and a wider conflict.

Days earlier, U.S. and Iranian officials ended ceasefire talks without agreement, setting the stage for the current standoff.

‘Locked And Loaded’ and Ready to Strike

Fresh warnings from Defense Secretary Pete Hegseth underscored how quickly the standoff with Iran could escalate, pairing diplomatic outreach with direct threats against the country’s energy sector.

“We are locked and loaded on your critical dual-use infrastructure…and your energy industry,” Hegseth said Thursday during a Pentagon briefing, adding that U.S. forces were “ready to go at the push of a button.”

The remarks came as U.S. naval forces enforce a blockade designed to choke off Iran’s oil exports, a pressure tactic short of direct strikes but one that could shift rapidly if negotiations collapse.

“Your energy is not moving and will not move,” Hegseth said, describing the effort as targeting Iran’s economic lifeline without immediately striking infrastructure.

He pointed to what U.S. officials have described as a diplomatic off-ramp, urging Iranian leadership to accept a deal while warning that rejecting it could trigger attacks on power generation and energy facilities.

Ships Turned Back as Blockade Tightens

New details from Caine show the U.S. blockade is already reshaping maritime traffic around Iran, with warships and aircraft pushing vessels away from key ports.

“This blockade applies to all ships, regardless of nationality, heading into or from Iranian ports,” Caine said during the Pentagon briefing Thursday.

The operation targets Iran’s ports and coastline rather than the Strait of Hormuz itself, but enforcement extends into both territorial seas and international waters, backed by surveillance aircraft, intelligence assets and carrier strike group firepower.

More than 10,000 U.S. personnel, along with over a dozen ships and dozens of aircraft, are enforcing the blockade, forming a layered presence designed to detect, track and intercept vessels before they reach Iranian-controlled waters.

The effort extends beyond the Middle East. U.S. forces in the Pacific are also tracking ships suspected of supporting Iranian oil exports, including so-called dark fleet tankers that operate outside sanctions and insurance systems.

Adm. Bradley Cooper, the top U.S. commander in the region, said more than 50,000 American service members are now deployed across the Middle East supporting the operation, underscoring the scale of the military posture during the ceasefire.

Turn Around or Be Boarded

Ships are already turning back as U.S. naval forces enforce the blockade, signaling immediate impact without a single boarding operation.

Caine said at least 13 vessels have reversed course rather than attempt to cross U.S. enforcement lines—the latest Pentagon tally as the blockade takes hold.

U.S. warships are issuing direct warnings to approaching vessels, with Navy crews broadcasting orders to turn around or face interception, boarding and possible seizure.

“If you do not comply with this blockade, we will use force,” a standard transmission warns ship captains nearing Iranian ports, according to the Pentagon briefing.

Officials described the operation as a “finely tuned machine,” combining destroyers, carrier-based aircraft and surveillance platforms to detect and pressure vessels long before they reach the blockade line, allowing U.S. forces to control traffic without firing a shot.

Cooper said the blockade is being enforced in real time by young sailors making split-second decisions in combat information centers and on the bridge, often just years out of training but entrusted with navigating warships through congested waterways.

Combat Could Restart at Any Moment

The pause in fighting may not last long, with U.S. military leaders warning the blockade could quickly give way to renewed combat.

“The joint force remains postured and ready to resume major combat operations at literally a moment’s notice,” Caine said Thursday.

The blockade follows a ceasefire ordered by President Donald Trump after earlier combat operations under what officials have called Operation Epic Fury, a campaign that set the conditions for the current standoff between Washington and Tehran. New casualty figures tied to that operation show 365 U.S. troops wounded in action and 13 killed as of early April.

Defense officials said the military has already demonstrated its ability to shift rapidly between large-scale combat and containment operations, warning that the transition back to strikes could happen just as quickly.

“We can make that transition again very quickly and even more powerfully than ever before,” Hegseth said.

Officials said Iran’s command-and-control capabilities have been “highly degraded,” limiting its ability to coordinate operations, but increasing its incentive to maintain the ceasefire to avoid renewed U.S. strikes.

Cooper said U.S. forces are using the pause in fighting to rearm, adjust tactics and apply lessons learned from recent combat, describing the military as a “learning organization” that is already adapting in real time.

Blockade Threatens Global Oil

The broader confrontation is centered on the Strait of Hormuz, a chokepoint that typically carries about 20% of the world’s oil supply, where even limited disruptions can ripple across global energy markets.

U.S. officials argue the blockade allows Washington to squeeze Iran’s economy without immediately escalating to strikes, while still keeping military options on the table against critical infrastructure if negotiations fail.

“This is the polite way that this can go,” Hegseth said Thursday, describing the operation as a step short of direct attacks.

But the pressure carries clear risks. A prolonged blockade or any move toward strikes could disrupt oil flows, rattle global markets and draw the U.S. and Iran closer to a wider conflict.

Hegseth also signaled frustration with allies outside the region, saying many countries rely on the waterway but have not contributed to maritime security operations, arguing that global partners should play a larger role in securing international shipping lanes.

Officials say regional partners including Bahrain, Saudi Arabia, the United Arab Emirates, Qatar, Kuwait and Jordan have played key roles in supporting the operation, with U.S. commanders describing those alliances as stronger than ever after fighting side by side.