The UN nuclear watchdog's board of governors on Thursday formally found that Iran isn't complying with its nuclear obligations for the first time in 20 years, a move that could lead to further tensions and set in motion an effort to restore United Nations sanctions on Tehran later this year.

The board of governors of the International Atomic Energy Agency, which convened for its quarterly meeting on Monday, is expected to decide later in the week that Iran is not…

Iran had warned European powers not to back the resolution, which carries the threat of an eventual referral to the UN Security Council.