Supreme Leader Ayatollah Ali Khamenei said on Monday Iran might enrich uranium up to 60% purity if the country needed it and would never yield to U.S. pressure over its nuclear activity, state television reported. Iran’s 2015 nuclear deal with six powers, which it has been breaching since the United States withdrew in 2018, caps the fissile purity to which Tehran can refine uranium at 3.67%, well under the 20% achieved before the agreement and far below the 90% suitable for a nuclear weapon. “Iran’s uranium enrichment level will not be limited to 20%. We will increase it to whatever level the country needs…We may increase it to 60%,” the TV quoted Khamenei as saying, upping the ante in a stand-off with U.S. President Joe Biden’s administration over the future of the fraying deal. “Americans and the European parties to the deal have used unjust language against Iran…Iran will not yield to pressure. Our stance will not change,” Khamenei said.