For decades, Iran has been subject to rigorous inspections of its core nuclear sites. Inspectors would visit its enrichment sites and check its stockpile of enriched uranium every couple of days, ensuring that Iran wasn’t diverting fissile material for a nuclear weapon.

As Iran suspends its cooperation with the International Atomic Energy Agency, its deputy foreign minister is speaking out about the damage to his country's nuclear program. NBC's Richard Engel report for TODAY from Tehran.

Iran’s president has ordered the country to suspend its cooperation with the International Atomic Energy Agency after American airstrikes hit its most-important nuclear facilities.