“We continue to urge Iran not to take further measures that undermine the nuclear deal to stop and to reverse all activities that are inconsistent with the JCPOA, including the production of low-enriched uranium,” an EU spokeswoman told reporters, referring to the deal’s formal name, the Joint Comprehensive Plan of Action (JCPOA).

Iran has said it will boost its uranium enrichment in a few hours above a cap set by the nuclear deal, a move that could mean the return of all economic sanctions on Tehran.