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
Deposit of instruments of ratification (UN)
28 July 2020
Biological Weapons Convention
Deposit of instruments of accession (Moscow)
24 August 1979
Chemical Weapons Convention
09 September 2003
Comprehensive Nuclear-Test-Ban Treaty
Signature (UN)
26 September 1996
Convention on Cluster Munitions
Signature (UN)
03 December 2008
Deposit of instruments of ratification (UN)
27 January 2020
Convention on Environmental Modification Techniques (ENMOD)
Deposit of instruments of accession (UN)
05 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)
09 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
Treaty on the Prohibition of Nuclear Weapons
Signature (UN)
20 September 2017
For treaties where the Secretary-General of the United Nations is not the depository, the records in this database rely on information provided to the United Nations by the depository States of those treaties. Some resources listed and/or hyperlinked on this page may be from individuals, organisations and entities other than the United Nations and are provided for information purposes only. The hyperlinking of outside resources is not an endorsement by the United Nations of the views expressed therein nor does the United Nations have control over the content or accuracy of information provided. No editorial comment is implied by the omission of a resource or website.