In a warning that signals a dramatic uptick in tensions, Iran’s top negotiator, Parliament speaker Mohammad Bagher Ghalibaf, said on Sunday that the rules of engagement have changed and urged the United States to understand the consequences before it is too late. He described the potential retaliation as “faster, heavier, and more painful.”

These remarks arrive almost a full week into the renewed conflict, on the eve of a US strike on Iranian oil tankers that followed Tehran’s attack on American warships in the region. US Central Command has denied reports that an Iranian surface vessel fired on a remotely‑controlled US vessel attempting to enter the Strait of Hormuz.

One of the key images from the conflict is a US‑released video showing the impact of the strike on the oil tankers. The footage, captured by the US Central Command, depicts the tanker being hit with a clearly visible “unclassified” label on the side.

US footage of oil tanker

Implications for the Gulf

The Strait of Hormuz remains a critical chokepoint for global energy supplies, with around nine million barrels of oil passing through each day. Tehran’s insistence on maintaining some level of control over the waterway comes into conflict with the US stance that the strait is open and supporting navigation via a southern route.

The prolonged engagement has already pushed gasoline prices above $5 per gallon in the US and increased global oil prices. With midterm elections looming, there is mounting pressure on President Trump to deliver a resolution before the war further drains national resources.

A map of the Gulf region illustrates the strategic importance of the Strait of Hormuz, highlighting its narrowness and proximity to several neighboring states.

Map of Gulf region showing Strait of Hormuz

Published 6 September 2026, 17:11 BST