Iran’s stockpile of uranium enriched close to weapon-grade level has increased more than 50% over the last three months, the International Atomic Energy Agency has reported. Iran ramped up production of uranium enriched to 60% levels of purity since November in defiance to being censured by the IAEA. That material can quickly be upgraded to weapon-grade levels, a concern long held by the US, Europe and Israel despite Iran’s repeated denials that its nuclear development is for military use. According to the IAEA, as of Feb. 8, Iran had…