North Korea and weapons of mass destruction

Summary

North Korea has the world's smallest stockpile of nuclear weapons, with an estimated 60 warheads and production of fissile material for six to seven warheads per year. North Korea is the tenth country to develop and most recent to openly test nuclear weapons. North Korea is also believed to have one of the world's largest chemical weapons stockpiles. North Korea is party to the Biological Weapons Convention, one of four UN members not to ratify the Chemical Weapons Convention, and the only country to announce withdrawal from the Non-Proliferation Treaty (NPT).