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"The Arms Control Association’s work is an important resource to legislators and policymakers when contemplating a new policy direction or decision."

– General John Shalikashvili
former Chairman of the Joint Chiefs of Staff
The Status of the Comprehensive Test Ban Treaty: Signatories and Ratifiers
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Last Reviewed: 
August 2022

Contact: Daryl Kimball, Executive Director, (202) 463-8270 x107

Despite overwhelming global support and decades of global efforts to promote the entry into force of the Comprehensive Test Ban Treaty (CTBT), the treaty’s enactment still appears a long way off, due to the treaty's unusually onerous entry into force provision, which requires ratification by 44 states (listed in Annex 2 of the treaty). To date, 187 states have signed and 174 have ratified the treaty. Of the 44 specified countries, India, Pakistan, and North Korea still have not signed, and six others (China, Egypt, Iran, Israel, the United States) have not yet ratified the pact. Although Russia ratified the CTBT in 2000, it withdrew its ratification of the CTBT in 2023 to "mirror" the posture of the United States; as a treaty signatory, Russia remains obligated not to take any action contrary to the object or purpose of the treaty, which bars all nuclear test explosions, at any yield.

For more information on the CTBT, see Comprehensive Test Ban Treaty at a Glance.

The following chart identifies the treaty’s signatories and ratifiers. States whose ratification is required for the treaty to take effect are shaded and marked with an asterisk (*).


Total Signatories: 187
Total Ratifiers: 177

Annex 2 Ratifications (out of 44): 35

Country
Signature
Ratification
Afghanistan 9/24/03 9/24/03
Albania 9/27/96 4/23/03
Algeria* 10/15/96 7/11/03
Andorra 9/24/96 7/12/06
Angola 9/27/96 3/20/15
Antigua and Barbuda 4/16/97 1/11/06
Argentina* 9/24/96 12/4/98
Armenia 10/1/96 7/12/06
Australia* 9/24/96 7/9/98
Austria* 9/24/96 3/13/98
Azerbaijan 7/28/97 2/2/99
Bahamas 2/4/05 11/30/07
Bahrain 9/24/96 4/12/04
Bangladesh* 10/24/96 3/8/00
Barbados 1/14/08 1/14/08
Belarus 9/24/96 9/13/00
Belgium* 9/24/96 6/29/99
Belize 11/14/01 3/26/04
Benin 9/27/96 3/6/01
Buhtan    
Bolivia 9/24/96 10/4/99
Bosnia and Herzegovina 9/24/96 10/26/06
Botswana 9/16/02 10/28/02
Brazil* 9/24/96 7/24/98
Brunei Darussalam 1/22/97 1/10/13
Bulgaria* 9/24/96 9/29/99
Burkina Faso 9/27/96 4/17/02
Burundi 9/24/96 9/24/08
Cambodia 9/26/96 11/10/00
Cameroon 11/16/01 2/6/06
Canada* 9/24/96 12/18/98
Cape Verde 10/1/96 3/1/06
Central African Republic 12/19/01 5/26/10
Chad 10/8/96 2/8/13
Chile* 9/24/96 7/12/00
China* 9/24/96  
Colombia* 9/24/96 1/29/08
Comoros 12/12/96  
Congo 2/11/97 9/2/14
Cook Islands 12/5/97 9/6/05
Costa Rica 9/24/96 9/25/01
Côte d'Ivoire 9/25/96 3/11/03
Croatia 9/24/96 3/2/01
Cuba    
Cyprus 9/24/96 7/18/03
Czech Republic 11/12/96 9/11/97
Dem. Republic of Congo* 10/4/96 9/28/04
Denmark 9/24/96 12/21/98
Djibouti 10/21/96 7/15/05
Dominica    
Dominican Republic 10/3/96 9/4/07
Ecuador 9/24/96 11/12/01
Egypt* 10/14/96  
El Salvador 9/24/96 9/11/98
Equatorial Guinea 10/9/96  
Eritrea 11/11/03 11/11/03
Estonia 11/20/96 8/13/99
Ethiopia 9/25/96 8/8/06
Fiji 9/24/96 10/10/96
Finland* 9/24/96 1/15/99
France* 9/24/96 4/6/98
Gabon 10/7/96 9/20/00
Gambia 4/9/03  
Georgia 9/24/96 9/27/02
Germany* 9/24/96 8/20/98
Ghana 10/3/96 06/14/11
Greece 9/24/96 4/21/99
Grenada 10/10/96 8/19/98
Guatemala 9/20/99 1/12/12
Guinea 10/3/96 09/20/11
Guinea-Bissau 4/11/97 09/30/13
Guyana 9/7/00 3/7/01
Haiti 9/24/96 12/1/05
Holy See 9/24/96 7/18/01
Honduras 9/25/96 10/30/03
Hungary* 9/25/96 7/13/99
Iceland 9/24/96

6/26/00

India*    
Indonesia* 9/24/96 2/6/12
Iran* 9/24/96  
Iraq 8/19/08 09/26/13
Ireland 9/24/96 7/15/99
Israel* 9/25/96  
Italy* 9/24/96 2/1/99
Jamaica 11/11/96 11/13/01
Japan* 9/24/96 7/8/97
Jordan 9/26/96 8/25/98
Kazakhstan 9/30/96 5/14/02
Kenya 11/14/96 11/30/00
Kiribati 9/7/00 9/7/00
Kuwait 9/24/96 5/6/03
Kyrgyzstan 10/8/96 10/02/03
Laos 7/30/97 10/5/00
Latvia 9/24/96 11/20/01
Lebanon 9/16/05 11/21/08
Lesotho 9/30/96 9/14/99
Liberia 10/1/96 8/17/09
Libya 11/13/01 1/6/04
Liechtenstein 9/27/96 9/21/04
Lithuania 10/7/96 2/7/00
Luxembourg 9/24/96 5/26/99
Macedonia 10/29/98 3/14/00
Madagascar 10/9/96 9/15/05
Malawi 10/9/96 11/21/08
Malaysia 7/23/98 1/17/08
Maldives 10/1/97 9/7/00
Mali 2/18/97 8/4/99
Malta 9/24/96 7/23/01
Marshall Islands 9/24/96 10/28/09
Mauritania 9/24/96 4/30/03
Maritius    
Mexico* 9/24/96 10/5/99
Micronesia 9/24/96 7/25/97
Moldova 9/24/97 1/16/07
Monaco 10/1/96 12/18/98
Mongolia 10/1/96 8/8/97
Montenegro 10/23/06 10/23/06
Morocco 9/24/96 4/17/00
Mozambique 9/26/96 11/4/08
Myanmar 11/25/96 9/21/16
Namibia 9/24/96 6/29/01
Nauru 9/8/00 11/12/01
Nepal 10/8/96  
Netherlands* 9/24/96 3/23/99
New Zealand 9/27/96 3/19/99
Nicaragua 9/24/96 12/5/00
Niger 10/3/96 9/9/02
Nigeria 9/8/00

9/27/01

Niue 4/9/12 3/5/14
North Korea*    
Norway* 9/24/96 7/15/99
Oman 9/23/99 6/13/03
Pakistan*    
Palau 8/12/03 8/1/07
Panama 9/24/96 3/23/99
Papua New Guinea 9/25/96  
Paraguay 9/25/96 10/4/01
Peru* 9/25/96 11/12/97
Philippines 9/24/96 2/23/01
Poland* 9/24/96 5/25/99
Portugal 9/24/96 6/26/00
Qatar 9/24/96 3/3/97
Romania* 9/24/96 10/5/99
Russia* 9/24/96

6/30/00 (*Revoked its ratification in 2023)

Rwanda 11/30/'2004 11/30/04
St. Kitts and Nevis 3/33/04 4/27/05
St. Lucia 10/4/96 4/5/01
St. Vincent and the Grenadines 7/2/09 9/23/09
Samoa 10/9/96 9/27/02
San Marino 10/7/96 3/12/02
Sao Tome and Principe 9/26/96  
Saudi Arabia    
Senegal 9/26/96 6/9/99
Serbia and Montenegro 6/8/01 5/19/04
Seychelles 9/24/96 4/13/04
Sierra Leone 9/8/00 9/17/01
Singapore 1/14/99 11/10/01
Slovakia* 9/30/96 3/3/98
Slovenia 9/24/96 8/31/99
Solomon Islands 10/3/96  
Somalia    
South Africa* 9/24/96 3/30/99
South Korea* 9/24/96 9/24/99
South Sudan    
Spain* 9/24/96 7/31/98
Sri Lanka 10/24/96  
Sudan 6/10/04 6/10/04
Suriname 1/14/97 2/7/06
Swaziland 9/24/96 9/21/16
Sweden* 9/24/96 12/2/98
Switzerland* 9/24/96 10/1/99
Syria    
Tajikistan 10/7/96 6/10/98
Tarzania 9/30/04 9/30/04
Thailand 11/12/96 9/25/18
Timor-Leste 9/26/08  
Togo 10/2/96 7/2/04
Tonga    
Trinidad and Tobago 10/8/09 5/26/10
Tunisia 10/16/96 9/23/04
Turkey* 9/24/96 2/16/00
Turkmenistan 9/24/96 2/20/98
Tuvalu 9/25/18  
Uganda 11/7/96 3/14/01
Ukraine* 9/27/96 2/23/01
United Arab Emirates 9/25/96 9/18/00
United Kingdom* 9/24/96 4/6/98
United States* 9/24/96  
Uruguay 9/24/96 9/21/01
Uzbekistan 10/3/96 5/29/97
Vanuatu 9/24/96 9/16/05
Venezuela 10/3/96 5/13/02
Viet Nam* 9/24/96 3/10/06
Yemen 9/30/96  
Zambia 12/3/96 2/23/06
Zimbabwe 10/13/99 2/13/19