The warning came as negotiations between Tehran and Washington remain stalled following a ceasefire in the U.S.-Israeli conflict with Iran that took effect on April 8, with control of the strait a central dispute.

Trump said the operation, dubbed “Project Freedom,” would begin on Monday and described it as a humanitarian effort to assist crews stranded amid the disruption to shipping.

In a social media post, he said U.S. forces would work to guide vessels safely out of the waterway.In response, Iran’s military central command said any transit through the strait must be coordinated with Iranian forces, warning that “any foreign armed force especially the aggressive U.S. military” entering the area would be attacked, according to a statement carried by state broadcaster IRIB and attributed to Major General Ali Abdollahi.

The standoff has disrupted global energy flows, with Iran effectively restricting the movement of oil, gas and fertilizer shipments through the strait, while the United States has imposed countermeasures targeting Iranian ports. Maritime data cited by AXSMarine indicated that more than 900 commercial vessels were in the Gulf as of April 29.

The United States Central Command said the escort mission would involve guided-missile destroyers, over 100 aircraft, unmanned platforms and around 15,000 personnel.The United Kingdom Maritime Trade Operations said the maritime security threat level in the strait remains “critical” due to ongoing military activity, advising vessels to coordinate with Omani authorities and consider alternative routing.

Diplomatic efforts to resolve the crisis have so far yielded little progress. Iran has proposed a framework for negotiations, including reopening the strait and lifting blockades, while U.S. officials have indicated discussions are ongoing but have not detailed specific terms.European officials have urged a negotiated resolution, warning of the economic impact of prolonged disruption.

Emmanuel Macron called for a coordinated reopening of the strait, while Germany’s foreign minister Johann Wadephul stressed the need for Iran to restore navigation and address nuclear concerns.Oil prices have risen sharply, trading about 50 percent above pre-conflict levels amid supply constraints linked to the strait, a key global energy corridor.