TEHRAN, Iran (AP) — Iran has broken the limit set on its stockpile of low-enriched uranium by its 2015 nuclear deal with world powers, international inspectors and Tehran said Monday, marking its first major departure from the unraveling agreement a year after the U.S. unilaterally withdrew from the accord.

The announcement by Iran's Foreign Minister Mohammad Javad Zarif and later confirmation by the U.N. nuclear watchdog puts new pressure on European nations trying to save the deal amid President Donald Trump's maximalist campaign targeting Tehran. Iran separately threatened to raise its uran...