"The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) is one of the great success stories of arms control. It has made major contributions to global security and economic well being. It has been remarkably successful in achieving its main goals and -- with nearly 190 parties -has become the most widely-adhered to arms control treaty in history. The NPT is an indispensable tool in preventing the spread of nuclear weapons." Signed on July 1, 1968; entered into force March 5, 1970.