The waters on nuclear testing are murky, with international observers casting doubt on whether the 2020 test even happened — ...

The head of the U.N.’s nuclear watchdog said Wednesday that “very detailed” measures to verify Iran’s nuclear activities must ...

An Iranian security official in protective clothing walks through part of the Uranium Conversion Facility just outside the ...

Since the dawn of the nuclear age, there have been efforts to limit nuclear arms. What does this treaty’s lapse mean for the ...