U.S. and Iran clash over whether an Iranian ship sunk in the Strait of Hormuz was armed, sparking diplomatic tensions and rising oil prices.

The U.S. and Iran are disputing whether an Iranian warship sunk in the Strait of Hormuz in early 2026 was armed, with the U.S. claiming it posed a threat and justified the use of force, while Iran denies it was armed and calls the sinking an act of aggression. The incident, occurring amid heightened regional tensions following Iran’s appointment of a new hardline supreme leader and increased military activity, has triggered diplomatic concerns and a surge in oil prices. The Pentagon has not disclosed details about the submarine involved, and Iran has demanded an explanation and international review. No casualties were reported, but the situation remains under investigation, with global attention focused on preventing escalation.