By Jana Choukeir, Eman Abouhassira and Susan HeaveyDUBAI/WASHINGTON, Aug 21 (Reuters) - Iran said on Friday that its response to any new U.S. threats would be "devastating" after Washington pledged to impose the toughest financial penalties in history with the aim of toppling the Iranian leadership.U.S. Treasury Secretary Scott Bessent said he would give details on Monday of the planned sanctions, after President Donald Trump warned of economic consequences against any country that provided "any type of lifeline to Iran."

US treasury secretary vows Washington will 'collapse' Islamic Republic regime, promises toughest sanctions yet; US targets Hezbollah with new sanctions, emphasizing ties to Tehran

Aug 20 (Reuters) - The United States will impose "the toughest sanctions in history" on Iran,U.S. Treasury Secretary Scott Bessent said on Thursday as he urged Beijing to…

Treasury chief to hold conference next week outlining plan on sanctions campaign

US Treasury Secretary Scott Bessent says Washington will impose its toughest sanctions on Iran, while China urges diplomacy and rejects sanctions pressure.