]] Nuclear weapons File:Fat man. jpg History Warfare Arms race Design Testing Effects Delivery Espionage Proliferation Arsenals Terrorism Civil defense Anti-nuclear opposition Nuclear-armed states United States · Russia United Kingdom · France China · India · Israel Pakistan · North Korea South Africa (fmr. ) This box: view • talk • edit Nuclear proliferation is a term now used to describe the spread of nuclear weapons, fissile material, and weapons-applicable nuclear technology and information, to nations which are not recognized as "Nuclear Weapon States" by the Treaty on the Nonproliferation of Nuclear Weapons, also known as the Nuclear Nonproliferation Treaty or NPT...