US Secretary of State Marco Rubio issued a blunt warning towards Iran, and the remarks unsettled global oil markets, triggering volatile trading as investors weighed the risk of renewed confrontation in the Gulf. Sharp rhetoric from senior US officials on Iran tends to move crude prices quickly given the country's role in regional supply routes, and traders responded by repricing risk premiums into oil contracts amid uncertainty over what action, if any, might follow.

The article does not provide further detail on the specific wording of Rubio's threat, the exact market movements, or the broader diplomatic context, as the underlying report text was not accessible beyond the headline and surrounding page content.