
VIENNA — Iran’s stock of uranium close to weapons grade has jumped since it announced a dramatic acceleration in enrichment in December and there has been no progress on resolving outstanding issues, two reports by the U.N. nuclear watchdog said Wednesday. The stock of uranium enriched to up to 60% fissile purity, close to the roughly 90% of bomb grade, has been a long-standing concern for Western powers, which say there is no civil justification for enriching uranium to such a high level. Iran says it seeks only peaceful nuclear...