Iran’s growing stockpile of nuclear fuel recently crossed a critical threshold, according to a report issued Tuesday by international inspectors: For the first time since President Trump abandoned the 2015 nuclear deal, Tehran appears to have enough enriched uranium to produce a single nuclear weapon, though it would take months or years to manufacture a warhead and deliver it over long distances. The International Atomic Energy Agency, which monitors nuclear capabilities and reports to the United Nations, also documented for the first time how Iran’s leadership blocked its inspectors from visiting three critical sites where there was evidence of past nuclear activity. The agency’s newly appointed director, Rafael Mariano Grossi, an Argentine diplomat who has spent most of his life working on nuclear issues, said it was urgent for “Iran immediately to cooperate fully with the agency” by allowing […]