DUBAI/WASHINGTON, Aug 21 (Reuters) - US Treasury chief Scott Bessent said the United States will impose "the toughest sanctions in history" on Iran, a move he suggested would lessen the need for new major military operations. U.S. Key points and original sources are listed below.

• DUBAI/WASHINGTON, Aug 21 (Reuters) - US Treasury chief Scott Bessent said the United States will impose "the toughest sanctions in history" on Iran, a move he suggested would lessen the need for new major military operations.S1

• U.S. warned allies and China to join Mr. Trump’s new campaign to isolate the Iranian economy, vowing that Washington would “collapse this regime” in Tehran.S2