Iran's higher-grade uranium stockpile falls after nuclear deal-IAEA

(Adds detail) VIENNA, Feb 20 (Reuters) - Iran's stockpile of higher-enriched uranium has declined significantly for the first time in four years after it stopped such enrichment activity under a landmark nuclear deal with world powers, the U.N. atomic agency reported on Thursday. The report by the International Atomic Energy Agency (IAEA) also indicated that Iran was meeting its commitments ...