WASHINGTON (AP) — Treasury Secretary Scott Bessent said Monday that new U.S. sanctions aim to block all potential sources of revenue for Iran and told nations to cut economic ties to Tehran or face retaliation.

Bessent said it's "no longer acceptable to operate in the gray spaces" of the conflict.

He did not name what countries could face potential secondary sanctions from the United States, but China, Turkey and the United Arab Emirates are Iran's largest trade partners.

"Let there be no ambiguity as to the position of the United States," Bessent told a news conference. "An economic engagement of any kind with this murderous regime will expose those responsible to the full reach of American power."

Washington has said the new sanctions aim to put more pressure on an economy already battered by previous sanctions and a U.S. naval blockade.