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In page Nuclear proliferation:

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After World War II, Sweden considered building nuclear weapons to deter a Soviet invasion. From 1945 to 1972 the Swedish government ran a clandestine nuclear weapons program under the guise of civilian defense research at the Swedish National Defence Research Institute. By the late 1950s, the work had reached the point where underground testing was feasible. However, at that time the Riksdag prohibited research and development of nuclear weapons, pledging that research should be done only for the purpose of defense against nuclear attack. The option to continue development was abandoned in 1966, and Sweden subsequently signed the Non-Proliferation Treaty in 1968. The program was finally concluded in 1972.[citation needed]