Foreign Minister Abbas Araghchi called the American operation an "outrageous, grave and unprecedented violation" of the United Nations Charter and international law.
As the world reacted to news of U.S. strikes on Iran's nuclear facilities, international officials largely responded with alarm and calls for restraint.
The Pentagon provided a briefing on the U.S. airstrikes on Iran Sunday morning, after President Trump took direct action for the first time in the escalating conflict between Israel and Iran.