US Declares a Naval Blockade of Iran and a 20% Toll on Hormuz Shipping, Escalating the War

President Donald Trump declared that the United States will reimpose a naval blockade of Iran's ports and charge a 20% fee on cargo moving through the Strait of Hormuz, a step beyond the exchange of strikes that has defined the past three weekends. Trump wrote that Washington is reinstating what he called "the Iranian blockade", which he said stops only Iran's ships and customers while leaving other countries open use of the strait in return for reimbursement. Bloomberg reported that the demand amounts to a 20% charge on all transiting cargo. United States Central Command (CENTCOM) said the blockade will begin Tuesday, July 14, at 4 p.m. Eastern time, covering the entire Iranian coastline and its oil terminals, with transit to non-Iranian destinations unimpeded and humanitarian shipments permitted subject to inspection.

A blockade of another state's ports is, under international law, an act of war. That places the declaration on a different footing from the strikes already under way, regardless of how fully the United States enforces it.

Oil prices rose sharply. CNBC reported that United States crude closed 9.4% higher at $78.14 a barrel and Brent crude rose 9.6% to $83.30, the highest for both benchmarks since June 15. Vessel traffic through the strait had already fallen 52% week over week before the announcement, according to figures from MarineTraffic by Kpler.

Iran and the United Nations both rejected the terms. The International Maritime Organization (IMO) said there is "no legal basis" for mandatory tolls to transit a strait. Iran's foreign minister, Abbas Araghchi, disputed US control of the waterway and said Iran "has always been the guardian of the Strait," while also writing that whoever secures safe passage should be compensated and that 20% "is of course too much." Trump has used the same word, calling the United States the strait's guardian. Each government asserts authority over the same water.

The blockade follows a renewed round of strikes over the weekend. The New York Times reported that the United States military said it struck dozens of Iranian targets, while Iran's army said it launched further drones at American military sites in the region. India's The Hindu reported, citing Iranian state media, that the Islamic Revolutionary Guard Corps (IRGC) said it had struck American bases in Jordan, Bahrain and Kuwait. The Financial Times reported that Trump insists the strait remains open while Tehran says it is closed. Independent confirmation of damage on either side remains limited.

For markets, the declaration converts a contested passage into one Washington intends to police directly. Earlier cycles of fighting kept a war premium in energy and shipping that eased when the shooting paused. A standing blockade, if enforced, would fix that premium as a recurring cost and force the customers of Iranian oil, led by China, to choose between the American terms and no cargo at all.