Participation in the Partial Test Ban Treaty
  Signed and ratified
  Acceded or succeeded
  Only signed
  Non-signatory

The list of parties to the Partial Test Ban Treaty encompasses the states who have signed and ratified or acceded to the international agreement prohibiting all test detonations of nuclear weapons except underground.

On August 5, 1963, the Partial Test Ban Treaty (PTBT) was opened for signature. The principal state authors (the Soviet Union, the United Kingdom, and the United States) signed the treaty that day. The PTBT came into force and closed for signature on October 10, 1963 with the ratification by the three principal states. Since then, states that did not sign the treaty can now only accede or succeed to it.

As of October 2018, 125 UN member states have ratified or acceded to the treaty, most recently Montenegro on 3 June 2006.[1] In addition, the Republic of China (Taiwan), which is currently only recognized by 11 UN member states, ratified the treaty prior to the United Nations General Assembly's vote to transfer China's seat to the People's Republic of China (PRC) in 1971.[2] A further 10 states have signed but not ratified the treaty. The instrument of ratification, accession, or succession is deposited at the respective capitals of the principal states of the treaty: Moscow, London, and Washington, D.C.

Ratified or acceded states

Multiple dates indicate the different days in which states submitted their signature or deposition, which varied by location. This location is noted by: (L) for London, (M) for Moscow, and (W) for Washington.

State[1][3][4][5] Signed Deposited Method
 Afghanistan Aug 8, 1963 (L, M, W) Mar 12, 1964 (L)
Mar 13, 1964 (W)
Mar 23, 1964 (M) 		Ratification as  Kingdom of Afghanistan
 Antigua and Barbuda Nov 16, 1988 (W)
Dec 26, 1988 (M)
Jan 26, 1989 (L) 		Succession from  United Kingdom
 Argentina Aug 8, 1963 (W)
Aug 9, 1963 (L, M) 		Nov 14, 1986 (L)
Nov 17, 1986 (M)
Nov 21, 1986 (W) 		Ratification
 Armenia Jun 7, 1994 (M, W) Accession
 Australia Aug 8, 1963 (L, M, W) Nov 12, 1963 (L, M, W) Ratification
 Austria Sep 11, 1963 (W)
Sep 12, 1963 (L, M) 		Jul 17, 1964 (L, M, W) Ratification
 Bahamas Aug 11, 1976 (L)
Aug 13, 1976 (W)
Aug 30, 1976 (M) 		Succession from  United Kingdom
 Bangladesh Mar 11, 1985 (M)
Mar 12, 1985 (W)
Mar 13, 1985 (L) 		Accession
 Belarus Oct 8, 1963 (M) Dec 16, 1963 (M) Ratification as  Byelorussian SSR
 Belgium Aug 8, 1963 (L, M, W) Mar 1, 1966 (L, M, W) Ratification
 Benin Aug 27, 1963 (W)
Sep 3, 1963 (L)
Oct 9, 1963 (M) 		Dec 15, 1964 (W)
Dec 23, 1964 (M)
Apr 22, 1965 (L) 		Ratification as  Republic of Dahomey
 Bhutan Jun 8, 1978 (W) Accession
 Bolivia Aug 8, 1963 (W)
Aug 21, 1963 (L, M) 		Aug 4, 1965 (M, W)
Jan 25, 1966 (L) 		Ratification
 Bosnia and Herzegovina Aug 15, 1994 (W) Succession from  SFR Yugoslavia
 Botswana Jan 15, 1968 (M)
Feb 14, 1968 (L)
Mar 4, 1968 (W) 		Succession from  United Kingdom
 Brazil Aug 8, 1963 (L, M, W) Dec 15, 1964 (M)
Jan 15, 1965 (W)
Mar 4, 1965 (L) 		Ratification
 Bulgaria Aug 8, 1963 (L, M, W) Nov 13, 1963 (W)
Nov 21, 1963 (M)
Dec 2, 1963 (L) 		Ratification as Bulgaria People's Republic of Bulgaria
 Canada Aug 8, 1963 (L, M, W) Jan 28, 1964 (L, M, W) Ratification
 Cape Verde Oct 24, 1979 (M) Accession
 Central African Republic Dec 22, 1964 (W)
Aug 24, 1965 (L)
Sep 25, 1965 (M) 		Accession
 Chad Aug 26, 1963 (W) Mar 1, 1965 (W) Ratification
 Chile Aug 8, 1963 (W)
Aug 9, 1963 (L, M) 		Oct 6, 1965 (L) Ratification
 Colombia Aug 16, 1963 (W)
Aug 20, 1963 (L, M) 		Oct 17, 1985 (L, W) Ratification
 Costa Rica Aug 9, 1963 (L)
Aug 13, 1963 (W)
Aug 23, 1963 (M) 		Jul 10, 1967 (W) Ratification
 Côte d'Ivoire Sep 5, 1963 (W) Feb 5, 1965 (W) Ratification as the  Republic of Ivory Coast
 Croatia Jun 8, 1993 (W) Succession from  SFR Yugoslavia
 Cyprus Aug 8, 1963 (L, M, W) Apr 15, 1965 (L)
Apr 21, 1965 (M)
May 7, 1965 (W) 		Ratification
 Czech Republic Jan 1, 1993 (M, W)
Apr 5, 1993 (L) 		Succession from  Czechoslovakia
Signed Aug 8, 1963
Ratified Oct 17, 1963
 Democratic Republic of the Congo Aug 9, 1963 (L, W)
Aug 12, 1963 (M) 		Oct 28, 1965 (W) Ratification
 Denmark Aug 9, 1963 (L, M, W) Jan 15, 1964 (L, M, W) Ratification
 Dominican Republic Sep 16, 1963 (W)
Sep 17, 1963 (L, M) 		Jun 3, 1964 (M)
Jun 18, 1964 (L)
Jul 22, 1964 (W) 		Ratification
 Ecuador Sep 27, 1963 (W)
Oct 1, 1963 (L, W) 		May 6, 1964 (W)
May 8, 1964 (L)
Nov 13, 1964 (M) 		Ratification
 Egypt Aug 8, 1963 (L, M, W) Jan 10, 1964 (L, M, W) Ratification as the  United Arab Republic
 El Salvador Aug 21, 1963 (W)
Aug 22, 1963 (L, M) 		Dec 3, 1964 (W)
Dec 7, 1964 (L)
Feb 9, 1965 (M) 		Ratification
 Equatorial Guinea Jan 16, 1989 (M) Accession
 Fiji Jul 14, 1972 (M)
Jul 18, 1972 (W)
Aug 14, 1972 (L) 		Succession from  United Kingdom
 Finland Aug 8, 1963 (L, M, W) Jan 9, 1964 (L, M, W) Ratification
 Gabon Sep 10, 1963 (W) Feb 20, 1964 (W)
Mar 4, 1964 (L)
Mar 9, 1964 (M) 		Ratification
 Gambia Apr 27, 1965 (M, W)
May 6, 1965 (L) 		Succession from  United Kingdom
 Germany Aug 19, 1963 (L, M, W) Dec 1, 1964 (L, W) Ratification as  West Germany
Also  East Germany
Signed Aug 8, 1963
Ratified Dec 30, 1963
 Ghana Aug 9, 1963 (W)
Sep 4, 1963 (L, M) 		Nov 27, 1963 (L)
Jan 9, 1964 (W)
May 31, 1965 (M) 		Ratification
 Greece Aug 8, 1963 (W)
Aug 9, 1963 (L, M) 		Dec 18, 1963 (L, M, W) Ratification as  Kingdom of Greece
 Guatemala Sep 23, 1963 (W) Jan 6, 1964 (W) Ratification
 Guinea-Bissau Aug 20, 1976 (M) Accession
 Honduras Aug 8, 1963 (W)
Aug 15, 1963 (L, M) 		Oct 2, 1964 (W)
Dec 2, 1964 (L) 		Ratification
 Hungary Aug 8, 1963 (L, M, W) Oct 21, 1963 (L, M)
Oct 22, 1963 (W) 		Ratification as the Hungary People's Republic of Hungary
 Iceland Aug 12, 1963 (L, M, W) Apr 29, 1964 (L, M, W) Ratification
 India Aug 8, 1963 (L, M, W) Oct 10, 1963 (L)
Oct 14, 1963 (M)
Oct 18, 1963 (W) 		Ratification
 Indonesia Aug 23, 1963 (L, M, W) Jan 20, 1964 (M)
Jan 27, 1964 (W)
May 8, 1964 (L) 		Ratification
 Iran Aug 8, 1963 (L, M, W) May 5, 1964 (L, M, W) Ratification as the Iran Empire of Iran
 Iraq Aug 13, 1963 (L, M, W) Nov 30, 1964 (L)
Dec 1, 1964 (W)
Dec 3, 1964 (M) 		Ratification
 Ireland Aug 8, 1963 (L, M, W) Dec 18, 1963 (L, W)
Dec 20, 1963 (M) 		Ratification
 Israel Aug 8, 1963 (L, M, W) Jan 15, 1964 (L, W)
Jan 28, 1964 (M) 		Ratification
 Italy Aug 8, 1963 (L, M, W) Dec 10, 1964 (L, M, W) Ratification
 Jamaica Aug 13, 1963 (L, M, W) Nov 11, 1991 (M)
Nov 22, 1991 (W) 		Ratification
 Japan Aug 14, 1963 (L, M, W) Jun 15, 1964 (L, M, W) Ratification
 Jordan Aug 12, 1963 (L, M, W) May 29, 1964 (L)
Jul 7, 1964 (M)
Jul 10, 1964 (W) 		Ratification
 Kenya Jun 10, 1965 (L)
Jun 11, 1965 (W)
Jun 30, 1965 (M) 		Accession
 Kuwait Aug 20, 1963 (L, M, W) May 20, 1965 (W)
May 21, 1965 (L)
Jun 17, 1965 (M) 		Ratification
 Laos Aug 12, 1963 (L, M, W) Feb 10, 1965 (L)
Feb 12, 1965 (W)
Apr 7, 1965 (M) 		Ratification as the  Kingdom of Laos
 Lebanon Aug 12, 1963 (W)
Aug 13, 1963 (L, M) 		May 14, 1965 (W)
May 20, 1965 (L)
Jun 4, 1965 (M) 		Ratification
 Liberia Aug 8, 1963 (W)
Aug 16, 1963 (L, M) 		May 19, 1964 (W)
May 22, 1964 (L)
Jun 16, 1964 (M) 		Ratification
 Libya Aug 9, 1963 (L, M)
Aug 16, 1963 (W) 		Jul 15, 1968 (L) Ratification as the  Kingdom of Libya
 Luxembourg Aug 13, 1963 (L)
Sep 3, 1963 (W)
Sep 13, 1963 (M) 		Feb 10, 1965 (L, M, W) Ratification
 Madagascar Sep 23, 1963 (W) Mar 15, 1965 (W) Ratification
 Malawi Nov 26, 1964 (M)
Nov 29, 1964 (W)
Jan 7, 1965 (L) 		Succession from  United Kingdom
 Malaysia Aug 8, 1963 (W)
Aug 12, 1963 (L)
Aug 21, 1963 (M) 		Jul 15, 1964 (M)
Jul 16, 1964 (L, W) 		Ratification
 Malta Nov 25, 1964 (M, W)
Dec 1, 1964 (L) 		Succession from  United Kingdom
 Mauritania Sep 13, 1963 (W)
Sep 17, 1963 (L, M) 		Apr 6, 1964 (W)
Apr 15, 1964 (L)
Apr 28, 1964 (M) 		Ratification
 Mauritius Apr 30, 1969 (M, W)
May 12, 1969 (L) 		Succession from  United Kingdom
 Mexico Aug 8, 1963 (L, M, W) Dec 27, 1963 (L, M, W) Ratification
 Mongolia Aug 8, 1963 (L, M) Nov 1, 1963 (M)
Nov 7, 1963 (L) 		Ratification as the  Mongolian People's Republic
 Montenegro Jun 3, 2006 (M)
Dec 12, 2006 (L) 		Succession from  Serbia and Montenegro[a]
 Morocco Aug 27, 1963 (W)
Aug 30, 1963 (L, M) 		Feb 1, 1966 (L)
Feb 18, 1966 (M)
Feb 21, 1966 (W) 		Ratification
 Myanmar Aug 14, 1963 (L, M, W) Nov 15, 1963 (L, M, W) Ratification as  Union of Burma
   Nepal Aug 26, 1963 (L, M)
Aug 30, 1963 (W) 		Oct 7, 1964 (L, M, W) Ratification as the Nepal Kingdom of Nepal
 Netherlands Aug 9, 1963 (L, M, W) Sep 14, 1964 (L, M, W) Ratification
 New Zealand Aug 8, 1963 (L, M, W) Oct 10, 1963 (L, W)
Oct 16, 1963 (M) 		Ratification
 Nicaragua Aug 13, 1963 (L, M, W) Jan 26, 1965 (L)
Feb 26, 1965 (M, W) 		Ratification
 Niger Sep 24, 1963 (L, M, W) Jul 3, 1964 (M)
Jul 6, 1964 (L)
Jul 9, 1964 (W) 		Ratification
 Nigeria Sep 2, 1963 (L)
Sep 4, 1963 (W)
Sep 2, 1964 (M) 		Feb 17, 1967 (L)
Feb 25, 1967 (M)
Feb 28, 1967 (W) 		Ratification
 Norway Aug 9, 1963 (L, M, W) Nov 21, 1963 (L, M, W) Ratification
 Pakistan Aug 14, 1963 (L, M, W) Mar 3, 1988 (L) Ratification
 Panama Sep 20, 1963 (W) Feb 24, 1966 (W) Ratification
 Papua New Guinea Oct 27, 1980 (L)
Nov 13, 1980 (M)
Mar 16, 1981 (W) 		Succession from  Australia
 Peru Aug 23, 1963 (L, M, W) Jul 20, 1964 (W)
Aug 4, 1964 (L)
Aug 21, 1964 (M) 		Ratification
 Philippines Aug 8, 1963 (L, M, W) Nov 10, 1965 (L)
Nov 15, 1965 (W)
Feb 8, 1966 (M) 		Ratification
 Poland Aug 8, 1963 (L, M, W) Oct 14, 1963 (L, M, W) Ratification as Poland People's Republic of Poland
 Romania Aug 8, 1963 (L, M, W) Dec 12, 1963 (L, M, W) Ratification as Romania People's Republic of Romania
 Russia Aug 5, 1963 (L, M, W) Oct 10, 1963 (L, M, W) Ratification as  Soviet Union
 Rwanda Sep 19, 1963 (W) Oct 22, 1963 (L)
Dec 16, 1963 (M)
Dec 27, 1963 (W) 		Ratification
 Samoa Sep 5, 1963 (L, M)
Sep 6, 1963 (W) 		Jan 15, 1965 (W)
Jan 19, 1965 (L)
Feb 8, 1965 (M) 		Ratification as  Western Samoa
 San Marino Sep 17, 1963 (W)
Sep 20, 1963 (L, M) 		Jul 3, 1964 (L)
Jul 9, 1964 (W)
Nov 27, 1964 (M) 		Ratification
 Senegal Sep 20, 1963 (W)
Sep 23, 1963 (L, M) 		May 6, 1964 (L)
May 12, 1964 (M)
Jun 2, 1964 (W) 		Ratification
 Serbia Aug 8, 1963 (M) Jan 31, 1964 (M) Ratification as  SFR Yugoslavia
Succession as  FR Yugoslavia (later known as  Serbia and Montenegro)
Succession as  Serbia on Jun 3, 2006
 Seychelles Mar 12, 1985 (L)
Mar 14, 1985 (M)
Apr 8, 1985 (W) 		Accession
 Sierra Leone Sep 4, 1963 (L, M)
Sep 11, 1963 (W) 		Feb 21, 1964 (L)
Mar 4, 1964 (W)
Apr 29, 1964 (M) 		Ratification
 Singapore Jul 12, 1968 (M, W)
Jul 23, 1968 (L) 		Succession from  Malaysia
 Slovakia Jan 1, 1993 (M, W)
May 17, 1993 (L) 		Succession from  Czechoslovakia
Signed Aug 8, 1963
Ratified Oct 14, 1963
 Slovenia Apr 7, 1992 (L)
Aug 20, 1992 (W) 		Succession from  SFR Yugoslavia
 South Africa Oct 10, 1963 (L, W)
Nov 22, 1963 (M) 		Accession
 South Korea Aug 30, 1963 (L, W) Jul 24, 1964 (L, W) Ratification
 Spain Aug 13, 1963 (W)
Aug 14, 1963 (L) 		Dec 17, 1964 (L, W) Ratification as  Spanish State
 Sri Lanka Aug 22, 1963 (L, W)
Aug 23, 1963 (M) 		Feb 5, 1964 (W)
Feb 12, 1964 (M)
Feb 13, 1964 (L) 		Ratification as  Dominion of Ceylon
 Sudan Aug 9, 1963 (L, M, W) Mar 4, 1966 (L, W)
Mar 28, 1966 (M) 		Ratification
 Suriname Jan 6, 1993 (L)
Apr 9, 1993 (W) 		Accession
 Swaziland May 29, 1969 (L, W)
Jun 3, 1969 (M) 		Accession
 Sweden Aug 12, 1963 (L, M, W) Dec 9, 1963 (L, M, W) Ratification
  Switzerland Aug 26, 1963 (L, M, W) Jan 16, 1964 (L, M, W) Ratification
 Syria Aug 13, 1963 (L, M, W) Jun 1, 1964 (L, M, W) Ratification
 Tanzania Sep 16, 1963 (L)
Sep 18, 1963 (W)
Sep 20, 1963 (M) 		Feb 6, 1964 (L) Ratification
 Thailand Aug 8, 1963 (L, M, W) Nov 15, 1963 (L)
Nov 21, 1963 (M)
Nov 29, 1963 (W) 		Ratification
 Togo Sep 18, 1963 (W) Dec 7, 1964 (W) Ratification
 Tonga Jun 22, 1971 (M)
Jul 7, 1971 (L, W) 		Succession from  United Kingdom
 Trinidad and Tobago Aug 12, 1963 (L, M, W) Jul 14, 1964 (W)
Jul 16, 1964 (L)
Aug 6, 1964 (M) 		Ratification
 Tunisia Aug 8, 1963 (W)
Aug 12, 1963 (L, M) 		May 26, 1965 (L, M)
Jun 3, 1965 (W) 		Ratification
 Turkey Aug 9, 1963 (L, M, W) Jul 8, 1965 (L, M, W) Ratification
 Uganda Aug 29, 1963 (L, W) Mar 24, 1964 (L)
Apr 2, 1964 (W) 		Ratification
 Ukraine Oct 8, 1963 (M) Dec 30, 1963 (M) Ratification as  Ukrainian SSR
 United Kingdom Aug 5, 1963 (L, M, W) Oct 10, 1963 (L, M, W) Ratification
 United States Aug 5, 1963 (L, M, W) Oct 10, 1963 (L, M, W) Ratification
 Uruguay Aug 12, 1963 (W)
Sep 27, 1963 (L, M) 		Feb 25, 1969 (L) Ratification
 Venezuela Aug 16, 1963 (W)
Aug 20, 1963 (L, M) 		Feb 22, 1965 (M)
Mar 3, 1965 (L)
Mar 29, 1965 (W) 		Ratification
 Yemen Jun 1, 1979 (M) Accession as  South Yemen
Also signed by  North Yemen on Sep 6, 1963 prior to Yemeni unification
 Zambia Jan 11, 1965 (M, W)
Feb 8, 1965 (L) 		Succession from  United Kingdom
Notes
  1. ^ Montenegro's effective date of succession was 3 June 2006.[6]

Partially recognized state abiding by treaty

The Republic of China (Taiwan), which is currently only recognized by 11 UN member states, ratified the treaty prior to the United Nations General Assembly's vote to transfer China's seat to the People's Republic of China (PRC) in 1971. The ROC has committed itself to continue to adhere to the requirements of the treaty, and the United States has declared that they still consider them to be "bound by its obligations".[2]

State Signed Deposited Method
 Republic of China Aug 23, 1963 (M) May 18, 1964 (M) Ratification

Signatory states

The following ten states have signed but not ratified the treaty.

State Signed
 Algeria Aug 14, 1963 (L, M, W)
 Burkina Faso Aug 30, 1963 (W)
 Burundi Oct 4, 1963 (W)
 Cameroon Aug 27, 1963 (W)
Sep 6, 1963 (L)
 Ethiopia Aug 9, 1963 (L, M, W)
 Haiti Oct 9, 1963 (W)
 Mali Aug 23, 1963 (L, M, W)
 Paraguay Aug 15, 1963 (L, M, W)
 Portugal Oct 9, 1963 (L, W)
 Somalia Aug 19, 1963 (M, W)

Non-signatory states

The remaining UN member states and UN observer states, which have not signed the treaty, are:

  1. ^ Signed by the Republic of Vietnam on 1 October 1963, but following the victory by the Democratic Republic of Vietnam in the Vietnam War, the reunified Socialist Republic of Vietnam renounced all treaty actions performed by the Republic of Vietnam.[4]

See also

References

  1. ^ a b "Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water". United Nations Office for Disarmament Affairs. Retrieved 2013-02-24.
  2. ^ a b "China: Ratification of Partial Test Ban Treaty". United Nations Office for Disarmament Affairs. Archived from the original on 2015-05-08. Retrieved 2015-02-14.
  3. ^ "Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water". Foreign and Commonwealth Office. Archived from the original (PDF) on 2013-01-04. Retrieved 2013-07-23.
    "Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water [London version]". Foreign and Commonwealth Office. Retrieved 2019-04-27.
  4. ^ a b "Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water". United States Department of State. 2010-10-06. Retrieved 2019-07-01.
  5. ^ Договор о запрещении испытаний ядерного оружия в атмосфере, в космическом пространстве и под водой (in Russian). Ministry of Foreign Affairs of Russia. 2013-01-16. Retrieved 2015-08-28.
  6. ^ "Montenegro: Succession to Partial Test Ban Treaty". United Nations Office for Disarmament Affairs. Retrieved 2016-08-10.

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