List of states with nuclear weapons

There are currently eight states that have successfully detonated nuclear weapons. Five are considered to be "nuclear-weapon states" (NWS) under the terms of the Nuclear Non-Proliferation Treaty (NPT). In order of acquisition of nuclear weapons these are: the United States, Russia (successor state to the Soviet Union), the United Kingdom, France, and China. Nations that are known or believed to possess nuclear weapons are sometimes referred to as the nuclear club.
Since the NPT entered into force in 1970, three states that were not parties to the Treaty have conducted nuclear tests, namely India, Pakistan, and North Korea. North Korea had been a party to the NPT but withdrew in 2003. Israel is also widely believed to have nuclear weapons, though it has refused to confirm or deny this, and is not known to have conducted a nuclear test.

The five nuclear-weapon states under the NPT

Country	Warheads active/total	Year of first test
United States	2,150 / 8,000	1945
Russia	1,800 / 10,000	1949
The United Kingdom	160 / 225	1952
France	290 / 300	1960
China	n.a. / 240	1960

 

 Non-NPT nuclear powers

India	n.a. / 80–100	1974
Pakistan	n.a. / 90–110	1998
North Korea	n.a. / <10	2006

  

Undeclared nuclear powers

Israel

n.a. / 80–200

possibly 1979