Tonga

1925 Geneva Protocol
Deposit of instruments of succession (Paris) 19 July 1971  
Biological Weapons Convention
Deposit of instruments of accession (London) 28 September 1976  
Chemical Weapons Convention
Deposit of instruments of accession (UN) 29 May 2003  
Outer Space Treaty
Deposit of instruments of succession (Moscow) 22 June 1971 *
Deposit of instruments of succession (Washington) 7 July 1971 *
Deposit of instruments of succession (London) 7 July 1971  
Partial Test Ban Treaty
Deposit of instruments of succession (Washington) 7 July 1971 *
Deposit of instruments of succession (London) 7 July 1971  
Deposit of instruments of succession (Moscow) 22 June 1971 *
Treaty of Rarotonga
Signature (PIFS) 2 August 1996  
Deposit of instruments of ratification (PIFS) 18 December 2000  
Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
Deposit of instruments of succession (London) 7 July 1971 *
Deposit of instruments of succession (Washington) 15 July 1971 *
Deposit of instruments of succession (Moscow) 24 August 1971 *