The U.S. will impose "the toughest sanctions in history" on Iran, Treasury Secretary Scott Bessent said Thursday, a focus on economic measures he suggested would lessen the need for new major military operations against ⁠Tehran.

His statement followed President Donald Trump's threat a day earlier of "Economic Warfare" ⁠and warning of economic consequences against any country that provided "any type of lifeline to Iran."

Oil prices rose to more than a three-week high on Thursday following those U.S. threats of financial penalties aimed at forcing an end to a nearly six-month-old war that has ​stranded millions of barrels of Middle Eastern oil.

"I'm not sure why oil has popped up on this," ​Bessent ⁠told CNBC. "If we are doing the maximum economic pressure, then that means that likely there will not be a large-scale kinetic restart," he said, using a term referring to military force.

Iran calls U.S. sanctions 'economic terrorism'