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.
United Nations Security Council Resolution 1747
Iran and weapons of mass destruction:
As of 2007, Iran is not known to possess weapons of mass destruction and has signed treaties repudiating their possessions, including the Biological Weapons Convention, the Chemical Weapons Convention, and the Nuclear Non-Proliferation Treaty (NPT). A number of countries, including the United States, the United Kingdom, and France, have accused Iran of a clandestine intention to develop nuclear weapons. By most estimates, Iran is at least two to six years away from being able to produce an atomic bomb, even if it wanted to.