Which countries are known to have nuclear weapons?
List of states with nuclear weapons
{'answer_start': array([279]), 'answer_text': array(['United States, Russia (the successor state to the Soviet Union), the United Kingdom, France, and China'],
      dtype=object)}
There are eight sovereign states that have successfully detonated nuclear weapons.[1] Five are considered to be nuclear-weapon states (NWS) under the terms of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). In order of acquisition of nuclear weapons these are: the United States, Russia (the successor state to the Soviet Union), the United Kingdom, France, and China.