The Trump administration’s attempt to squeeze revenue from one of the world’s most vital shipping lanes has rapidly morphed into a deadly U.S.–Iran confrontation and an oil price shock.

Fee threat raises the stakes

In early July, President Donald Trump demanded a 20% fee on all cargoes transiting the Strait of Hormuz, framing it as a way for the U.S. to monetize its security role in the Gulf.¹ Iran responded by targeting tankers with cruise missiles, drawing immediate U.S. air strikes and turning the narrow waterway into a live-fire zone.¹

From economic leverage to blockade and tanker strikes

As clashes mounted, the U.S. hit a tanker bound for Iran’s Kharg Island oil terminal under what officials described as a renewed Iran blockade, highlighting how the fight over transit fees had escalated into a broader battle for control of Hormuz.² Military confrontations around the strait were soon threatening global oil supplies, alarming energy markets and allies alike.²

Facing criticism from Gulf partners and traders, Trump then said the U.S. would abandon the proposed Strait of Hormuz cargo fee, promising instead to “replace” the plan with Gulf investment as the Pentagon acknowledged it had already launched a seventh wave of strikes on Iranian targets.³

U.S. casualties and a widening regional war

Iran expanded the conflict beyond the waterway, striking Gulf states and U.S. positions. After two American troops were killed in Jordan, Washington retaliated with fresh strikes on Iranian military facilities, further intensifying the battle for control of the Strait of Hormuz.⁴ Over the following days, the U.S. military reported additional casualties and launched a ninth consecutive wave of strikes, as the regional death toll climbed and fears of a wider war grew.⁵

Oil hits $90 and mediators step in

With tankers under fire and a naval blockade in place, Brent crude surged, and oil touched $90 a barrel as Iran’s attacks on shipping rattled global markets.⁶ Prices later eased after Tehran said it had received proposals from mediators about the war, hinting at possible de-escalation but underscoring how a fee gambit had evolved into a full‑blown energy and security crisis.⁶