| Declared nuclear weapon nations||Countries of past concern. These countries took steps to develop nuclear weapon capabilities during the 1970s, but have terminated these activities.|
De facto nuclear weapon nations. These countries are thought able to deploy one or more nuclear weapons within months or to have already deployed them.
Abstaining countries. These countries have the technological base, but not the intent, to develop nuclear weapons. A number have installations under international inspection that can produce nuclear weapons material.
Countries to monitor. These countries have taken steps since 1980 to develop nuclear weapon capabilities or to acquire nuclear weapons--or appear strongly motivated to do so.
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