Strait of Hormuz carries nearly 20% of global oil supply|NASA Johnson|CC BY-NC-ND 2.0

President Donald Trump said the US would blockade the Strait of Hormuz after talks held in Pakistan to end the Iran war failed to reach a resolution over the weekend.

Washington offered to ease sanctions and normalize relations, while demanding strict limits on Iran’s nuclear program.

Tehran rejected key conditions, citing security concerns after recent attacks, and refused to fully open the Strait of Hormuz with no tolls on vessels. The passage carries nearly 20% of the global oil supply, but disruptions have already pushed prices up by more than 50% during the conflict.

Trump’s statement has increased uncertainty on the delicate two-week ceasefire between the US and Iran.

Tensions escalated after the president warned that the US Navy would begin blockading vessels linked to Iran.

However, US Central Command later clarified that forces will target ships entering or leaving Iranian ports, not fully shut the Strait. The operation begins today at 10 a.m. ET and will apply to vessels of all nations, with prior notices issued to commercial shippers. Transit to non-Iranian ports will continue.

The move aims to cut Iran’s oil revenues, which averaged about 1.85 million barrels per day through March, but risks disrupting global energy markets.

Trump also said that the US Navy will intercept any vessel that has paid a toll to Iran.

Oil tops $100
Oil prices surged above $100 per barrel, with Brent and US crude rising over 7%, to $101.87, while West Texas Intermediate gained 7.5% to $103.83.

Analysts warn the blockade could restrict up to 2 million barrels per day, tightening supply and increasing fuel costs worldwide.

Markets reacted sharply to rising geopolitical risks, pushing prices back into triple digits.

Experts stressed that avoiding another conflict remains critical after a six-week war caused heavy military losses and deep economic strain on both sides.