Key
	Nuclear weapons programs that began before 1970 when the Nuclear Non-Proliferation Treaty (NPT) came into force, succeeded, and are still ongoing
	Programs that essentially ended by the time NPT started
	Factions within advocated for or sought nuclear weapons, but these ambitions ended by the time NPT started
	Programs that ended after 1970
Programs that started after 1970 and:       Succeeded and are ongoing       Are suspected to be actively seeking nuclear weapons       Are now ended
	Intentions suspected but no nuclear weapons program identified
	Inherited nuclear weapons, but now a non-nuclear weapon state party to the NPT

Please note:

• No evidence exists of an Argentine nuclear weapons program, but suspicions remain that one existed.
• Spain, which had a military dictatorship, developed unsafeguarded nuclear facilities during the 1960s and 1970s. U.S. officials said in the late 1980s that they suspected that Spain had nuclear weapons ambitions or a program.
• Nigeria and Indonesia are occasionally named as countries that had nuclear weapons intentions, but these claims have not been substantiated and thus are not included here.