Vertical proliferation: Increased numbers, types, and methods of deployment of nuclear weapons by countries already having such weapons, and particularly by the two superpowers.
Horizontal proliferation: Additional countries with deployable or deployed nuclear weapons.
Potential capability: Still other countries with a capability to rapidly manufacture nuclear weapons, should a decision be made to do so.
Subnational potential: The possibility of manufacture of nuclear weapons from material diverted or stolen, as by terrorist or criminal groups intent on blackmail.
KeywordsPower Reactor Nuclear Weapon Fuel Cycle Spend Fuel Isotope Separation
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