Weapon of mass destruction
The only country to have used a nuclear weapon in war is the United States, which dropped two atomic bombs on the Japanese cities of Hiroshima and Nagasaki during World War II. There are eight countries that have declared they possess nuclear weapons and are known to have tested a nuclear weapon, only five of which are members of the NPT. The eight are China, France, India, North Korea, Pakistan, Russia, the United Kingdom, and the United States.
Treaty on the Non-Proliferation of Nuclear Weapons
On 24 April 2014, it was announced that the nation of the Marshall Islands has brought suit in The Hague against the United States, the former Soviet Union, the United Kingdom, France, China, India, Pakistan, North Korea and Israel seeking to have the disarmament provisions of the NNPT enforced.