This map layer shows where the Nuclear Non-Proliferation Treaty has been ratified.
The Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Nuclear Non-Proliferation Treaty (NPT), entered into force in 1970. The states that have ratified this Treaty undertake to dismantle their nuclear capabilities or not to acquire such weapons. However, every country is granted a right to pursue civil nuclear programmes, and the treaty explicitly encourages exchange on peaceful uses. The International Atomic Energy Agency (IAEA) has the task of checking on treaty compliance and undertakes notified on-site inspections. Although, in the 1970s, many experts predicted that little could be done to prevent the proliferation of nuclear weapons systems, only four more states have since become nuclear-weapon powers (India, Israel, North Korea, Pakistan).