Iran's Zarif says there won't be a better nuclear deal than 2015 accord

World powers will not be able to negotiate a better deal with Iran than the landmark 2015 nuclear deal, Iran's Foreign Minister Mohammad Javad Zarif tweeted on Monday. Iran threatened on Monday to restart deactivated centrifuges and ramp up its enrichment of uranium to 20 percent purity as its next potential big moves away from the agreement that Washington abandoned last year. "#B_Team sold @realDonaldTrump on the folly that killing #JCPOA thru #EconomicTerrorism can get him a better deal," Zarif wrote, referring to the nuclear deal by its acronym, the Joint Comprehensive Plan of Action (JCPOA).