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The Arms Control Association is an "exceptional organization that effectively addresses pressing national and international challenges with an impact that is disproportionate to its small size." 

– John D. and Catherine T. MacArthur Foundation
January 19, 2011
The Status of the Comprehensive Test Ban Treaty: Signatories and Ratifiers
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Last Reviewed: 
February 2019

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

Despite nearly 20 years of global efforts to promote the entry into force of the Comprehensive Test Ban Treaty (CTBT), the treaty’s enactment appears a long way off.

President George H. W. Bush signed into law the unilateral declaration to forego full-scale nuclear weapons testing October 2, 1992. The United States signed the CTBT on September 24, 1996, the day it opened for signature, but the Senate dealt a severe blow to the near-term prospects for U.S. participation when it refused to provide its advice and consent October 13, 1999. President Obama, however, stated in February 2009 that he intended to pursue Senate advice and consent to ratification of the treaty "immediately and aggressively."

The CTBT will formally enter into force after 44 designated “nuclear-capable states” (as listed in Annex 2 of the treaty) have deposited their instruments of ratification with the UN secretary-general. To date, 184 states have signed and 168 have ratified the treaty. Yet of the 44 specified countries, India, Pakistan, and North Korea still have not signed, and only 36 have ratified the treaty.

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: 184
Total Ratifiers: 168

Annex 2 Ratifications (out of 44): 36

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
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