A.M. Edition for Mar. 18. Gulf leaders insist on crippling Iran’s regime before ending the war, marking a major pivot from a region that once courted Tehran. Plus, as fighting drags on, Barclays’ Emmanuel Cau discusses why the mood in U.S. equity markets has remained largely upbeat. And bad news for the struggling U.S. Postal Service, as Amazon plans to take its business elsewhere. Luke Vargas hosts. Sign up for the WSJ’s free What’s News newsletter. Learn more about your ad choices. Visit megaphone.fm/adchoices