<P> Five states are recognized by NPT as nuclear weapon states ( NWS ) : China ( signed 1992 ) , France ( 1992 ) , the Soviet Union ( 1968 ; obligations and rights now assumed by the Russian Federation ) , the United Kingdom ( 1968 ) , and the United States ( 1968 ) . These five nations are also the five permanent members of the United Nations Security Council . </P>
<P> Five states are recognized by NPT as nuclear weapon states ( NWS ) : China ( signed 1992 ) , France ( 1992 ) , the Soviet Union ( 1968 ; obligations and rights now assumed by the Russian Federation ) , the United Kingdom ( 1968 ) , and the United States ( 1968 ) . These five nations are also the five permanent members of the United Nations Security Council . </P>
when did the us sign the nuclear non-proliferation treaty
when did the us sign the nuclear non-proliferation treaty
1968
1968