TEHRAN, Iran—Iran has produced more than 120 kilograms (265 pounds) of 20 percent enriched uranium, the country’s nuclear chief said, far more than what the U.N. nuclear watchdog reported last month. Mohammad Eslami said in an interview with state TV late Saturday that under the 2015 nuclear deal with world powers, the other signatories were to provide Iran with 20 percent enriched uranium needed for its reactor. “But it was not delivered,” he said. “If we did not produce it by ourselves, this would have turned into one of our problems.” Under the terms of the nuclear deal, Iran was prohibited from enriching uranium above 3.67 percent with the exception of its research reactor activities. Enriched uranium above 90 percent can be used in a nuclear weapon. In September, the International Atomic Energy Agency said Iran’s stockpile of uranium enriched to up to 20 percent fissile purity was estimated at …