The move follows the breakdown of ceasefire negotiations between the two sides in Pakistan, where key disputes reportedly included control of the vital waterway, Iran’s nuclear program, and frozen assets.
A statement from Iran’s Khatam al-Anbiya central command, read on state television, declared: “The restrictions imposed by criminal America on maritime navigation and transit in international waters are illegal and constitute an example of piracy.”
It added that the security of ports in the region “is either for everyone or for no one,” warning that any threat to Iranian shipping would endanger all Gulf ports.
U.S. President Donald Trump had announced the blockade, stating the Navy would target vessels linked to Iranian ports and coastal areas. U.S. Central Command confirmed enforcement would begin around 10 a.m. ET, with warnings that Iranian fast-attack vessels approaching the blockade could be “eliminated.”
Officials emphasized the action aims to counter Iran’s prior restrictions on the strait.
The Strait of Hormuz, a narrow passage between the Persian Gulf and the Gulf of Oman, is one of the world’s most strategic energy routes.
Global oil markets reacted with volatility as traders assessed potential supply disruptions.
The UK has indicated it will not participate in the U.S. blockade, while other allies monitor the situation closely.
This latest confrontation risks further escalation in the broader U.S.-Israel-Iran conflict, with both sides exchanging strong rhetoric.
Iran has insisted it maintains the right to control passage in the strait under certain conditions, while the U.S. frames its actions as necessary to prevent extortion and ensure open navigation.
As of Monday afternoon, reports indicated tanker movements were being affected, with some vessels racing to exit the area ahead of full enforcement.
The situation remains fluid, with potential for direct naval confrontations if tensions are not de-escalated.
