The Trump administration has imposed new sanctions on Iran, saying it will punish countries that purchase Iranian copper, aluminum or other metals. The new sanctions came after Iran announced it will stop complying with parts of the landmark 2015 nuclear deal and resume high-level enrichment of uranium in 60 days if other signatories of the deal do not take action to shield Iran’s oil and banking sectors from U.S. sanctions. That move, in turn, came a year after the Trump administration pulled out of the nuclear deal, even as European allies and the United Nations said Iran was in full compliance.