The ultimate success of the U.S. and Israeli strikes, and so Trump's decision to intervene militarily, depends on how Iran chooses to react. Some analysts fear this action will accelerate Iranian efforts to build a nuclear weapon, with hardliners in Tehran now viewing it as an urgent priority.

The Iranian government has suspended cooperation with the U.N.'s International Atomic Energy Agency until the security of Iran's nuclear facilities and activities is assured.

Iran's president enacted a law passed by the country's parliament that severs ties with the International Atomic Energy Agency, a U.N. watchdog, following Tehran's recent conflict with the U.S. and Israel.