In February 2020, it was reported that of the 1021 kg of low-enriched uranium (LEU) mass under safeguards in Iran, only 214.6 kg was between 2-3.67% and 537.8 kg between 3.67-4.5% (total of 752.4 kg). In the latest IAEA June 2020 reporting, the same subtotal of 2-4.5% LEU, which can only be used for weaponization after enrichment to a much higher percentage, is placed at 1089 kg of the total 1572 kg of LEU currently in Iran. Experts place the "key threshold" of usable LEU at that level of enrichment between 1,000-1,100 kg. Thus, Iran has passed what many consider as enough LEU for a single nuclear weapon. However, all of Iran's LEU continues to be under close observation by the IAEA and there has not been any operational shifts to infer that the material will be enriched further.