List of parties to the Partial Nuclear Test Ban Treaty

Last updated November 13, 2023

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 12 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 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 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 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 ^{[lower-alpha 1]}
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 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 People's Republic of Poland
Romania	Aug 8, 1963 (L, M, W)	Dec 12, 1963 (L, M, W)	Ratification as 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

↑ 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 12 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:

↑ 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]

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References

1 2 "Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water". United Nations Office for Disarmament Affairs . Retrieved 2013-02-24.
1 2 "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.
↑ "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.
1 2 "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.
↑ 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.
↑ "Montenegro: Succession to Partial Test Ban Treaty". United Nations Office for Disarmament Affairs . Retrieved 2016-08-10.

External links

Limited Test Ban Treaty at the U.S. Department of State

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[7] Montenegro's effective date of succession was 3 June 2006.^[6]

[8] 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]

[UDODA-1] 1 2 "Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water". United Nations Office for Disarmament Affairs . Retrieved 2013-02-24.

[china-2] 1 2 "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.

[usa-4] 1 2 "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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