Iran began enriching uranium to 60% purity in order to show its technical capacity after a sabotage attack at a nuclear plant, and the move is quickly reversible if the United States lifts sanctions, the Iranian government said on Tuesday.
Talks in Vienna aimed at bringing the United States and Iran back to full compliance with a 2015 nuclear deal have been further complicated by an explosion at Iran's main uranium enrichment facility at Natanz.
Iran has responded by saying it is enriching uranium to 60% fissile purity, a big step towards weapons-grade from the 20% it had previously achieved. The 2015 pact between Iran and world powers had capped the level of enrichment purity at 3.67% - suitable for generating civilian nuclear energy. Iran denies seeking a nuclear weapon.