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.
India as an emerging superpower
India has possessed nuclear weapons since 1974, when it did the Pokharan I nuclear tests, and the means to deliver them over long distances. However, India is not a signatory to the Nuclear Non-Proliferation Treaty (on grounds of security concerns and that India condemns the NPT as discriminatory).