Iran is a party to the Nuclear Non-Proliferation Treaty and says its program is peaceful. The International Atomic Energy Agency monitors declared nuclear facilities through safeguards agreements.
Key terms include enrichment, which raises the share of a useful uranium isotope, and breakout time, which is the estimated time to produce enough material for a weapon. In 2015, Iran and major powers agreed to the Joint Comprehensive Plan of Action, and the United States withdrew from it in 2018.
Events since then have been complex, so consult current IAEA reports and official statements for the latest.
