Sao Tome and Principe

Anti-Personnel Mine Ban Convention
Signature (UN) 30 April 1998  
Deposit of instruments of ratification (UN) 31 March 2003  
Arms Trade Treaty
Signature (UN) 19 December 2014  
Biological Weapons Convention
Deposit of instruments of accession (Moscow) 24 August 1979  
Chemical Weapons Convention
Deposit of instruments of acceptance (UN) 9 September 2003  
Comprehensive Nuclear-Test-Ban Treaty
Signature (UN) 26 September 1996  
Convention on Cluster Munitions
Signature (UN) 3 December 2008  
Convention on Environmental Modification Techniques (ENMOD)
Deposit of instruments of accession (UN) 5 October 1979  
International Convention for the Suppression of Acts of Nuclear Terrorism
Signature (UN) 19 December 2005  
Kinshasa Convention
Signature (UN) 19 November 2010  
Deposit of instruments of ratification (UN) 23 March 2017  
Pelindaba Treaty
Signature (African Union) 9 July 1996  
Sea-Bed Treaty
Deposit of instruments of accession (Moscow) 24 August 1979  
Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
Deposit of instruments of accession (Moscow) 20 July 1983