| | Arms Control Association: Fact Sheets: The State of Nuclear Proliferation 2001 |
 | | The nuclear-weapon states (NWS) are recognized as such by the 1968 nuclear Non-Proliferation Treaty (NPT) in accordance with the treaty's categorical restriction of NWS status to those nations that "manufactured and exploded a nuclear weapon or other nuclear explosive device prior to 1 January 1967" (Article IX, Section 3). |
 | | Estimates of the current arsenals of the de facto nuclear powers based on the known amount of fissile material are: India (45 to 95 warheads), Israel (75 to 125 warheads), and Pakistan (30 to 50 warheads). |
 | | All three states have returned to Russia the Soviet nuclear weapons previously based on their territory, and under the provisions of the Lisbon Protocol to the START I accord, have acceded to the NPT (Belarus, November 1996; Kazakhstan, April 1995; and Ukraine, June 1996). |
| www.armscontrol.org /factsheets/statefct.asp (1576 words) |