By Jana Choukeir and Susan HeaveyDUBAI/WASHINGTON, Aug 21 (Reuters) - U.S. US says it will impose ’toughest sanctions in history’ on Iran Key points and original sources are listed below.

• By Jana Choukeir and Susan HeaveyDUBAI/WASHINGTON, Aug 21 (Reuters) - U.S. 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

• US says it will impose ’toughest sanctions in history’ on IranS2

• The latest escalation comes as Washington seeks to tighten economic pressure on Tehran while keeping energy markets and China’s role in focusS3

• US Treasury Secretary Bessent says new economic measures will 'collapse' Iranian government.S4

• Aug 20 (Reuters) - U.S. Treasury Secretary Scott Bessent said on Thursday Washington will impose "the toughest sanctions in history" on Iran and urged Beijing to cooperate with the U.S., but China said sanctions will not help in resolving the issue.Bessent sai...S5