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.

The International Atomic Energy Agency (IAEA) said Friday its inspectors have departed Tehran and arrived safely to Vienna after Iran suspended cooperation in the wake of attacks on its nuclear program by Israel and the United States.

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.