“The news comes amid heightened U.S. fears of a possible Iranian attack, one year after the assassination of Iranian Gen. Qassem Soleimani. 20% enriched uranium — which is banned under the 2015 nuclear deal — can’t be used for military purposes, but is a step closer to the 90% enrichment needed to build a nuclear bomb.” Iran resumes 20% uranium enrichment, seizes South Korean tanker.