Arms control & security
Comprehensive Nuclear-Test-Ban Treaty
Not yet in force
This treaty hasn’t reached the number of ratifications its own text requires to take legal effect yet — signatures and early ratifications below are genuine steps toward that, not errors or missing data.
Source: UN Treaty Collection · scraped 2026-09-26
Figures below count the 193 UN member states separately from other parties to this treaty (international organizations and non-member observer states) — a treaty can have more parties than there are UN member states.
176/193
RatifiedUN member states
179 in total, incl. 3 non-UN members (Cook Islands, Holy See, Niue)
9
Signed, not ratifiedUN member states
0
WithdrawnUN member states
8
No actionUN member states
| Country | Signature | Ratification | Withdrawal | Status |
|---|---|---|---|---|
| Afghanistan | 2003-09-24 | 2003-09-24 | — | Ratified |
| Albania | 1996-09-27 | 2003-04-23 | — | Ratified |
| Algeria | 1996-10-15 | 2003-07-11 | — | Ratified |
| Andorra | 1996-09-24 | 2006-07-12 | — | Ratified |
| Angola | 1996-09-27 | 2015-03-20 | — | Ratified |
| Antigua and Barbuda | 1997-04-16 | 2006-01-11 | — | Ratified |
| Argentina | 1996-09-24 | 1998-12-04 | — | Ratified |
| Armenia | 1996-10-01 | 2006-07-12 | — | Ratified |
| Australia | 1996-09-24 | 1998-07-09 | — | Ratified |
| Austria | 1996-09-24 | 1998-03-13 | — | Ratified |
| Azerbaijan | 1997-07-28 | 1999-02-02 | — | Ratified |
| Bahamas | 2005-02-04 | 2007-11-30 | — | Ratified |
| Bahrain | 1996-09-24 | 2004-04-12 | — | Ratified |
| Bangladesh | 1996-10-24 | 2000-03-08 | — | Ratified |
| Barbados | 2008-01-14 | 2008-01-14 | — | Ratified |
| Belarus | 1996-09-24 | 2000-09-13 | — | Ratified |
| Belgium | 1996-09-24 | 1999-06-29 | — | Ratified |
| Belize | 2001-11-14 | 2004-03-26 | — | Ratified |
| Benin | 1996-09-27 | 2001-03-06 | — | Ratified |
| Bhutan | — | — | — | No action |
| Bolivia | 1996-09-24 | 1999-10-04 | — | Ratified |
| Bosnia and Herzegovina | 1996-09-24 | 2006-10-26 | — | Ratified |
| Botswana | 2002-09-16 | 2002-10-28 | — | Ratified |
| Brazil | 1996-09-24 | 1998-07-24 | — | Ratified |
| Brunei Darussalam | 1997-01-22 | 2013-01-10 | — | Ratified |
| Bulgaria | 1996-09-24 | 1999-09-29 | — | Ratified |
| Burkina Faso | 1996-09-27 | 2002-04-17 | — | Ratified |
| Burundi | 1996-09-24 | 2008-09-24 | — | Ratified |
| Cabo Verde | 1996-10-01 | 2006-03-01 | — | Ratified |
| Cambodia | 1996-09-26 | 2000-11-10 | — | Ratified |
| Cameroon | 2001-11-16 | 2006-02-06 | — | Ratified |
| Canada | 1996-09-24 | 1998-12-18 | — | Ratified |
| Central African Republic | 2001-12-19 | 2010-05-26 | — | Ratified |
| Chad | 1996-10-08 | 2013-02-08 | — | Ratified |
| Chile | 1996-09-24 | 2000-07-12 | — | Ratified |
| China | 1996-09-24 | — | — | Signed, not ratified |
| Colombia | 1996-09-24 | 2008-01-29 | — | Ratified |
| Comoros | 1996-12-12 | 2021-02-19 | — | Ratified |
| Congo | 1997-02-11 | 2014-09-02 | — | Ratified |
| Cook IslandsNon-UN member | 1997-12-05 | 2005-09-06 | — | Ratified |
| Costa Rica | 1996-09-24 | 2001-09-25 | — | Ratified |
| Croatia | 1996-09-24 | 2001-03-02 | — | Ratified |
| Cuba | 2021-02-04 | 2021-02-04 | — | Ratified |
| Cyprus | 1996-09-24 | 2003-07-18 | — | Ratified |
| Czech Republic | 1996-11-12 | 1997-09-11 | — | Ratified |
| Côte d'Ivoire | 1996-09-25 | 2003-03-11 | — | Ratified |
| Democratic People's Republic of Korea | — | — | — | No action |
| Democratic Republic of the Congo | 1996-10-04 | 2004-09-28 | — | Ratified |
| Denmark | 1996-09-24 | 1998-12-21 | — | Ratified |
| Djibouti | 1996-10-21 | 2005-07-15 | — | Ratified |
| Dominica | 2022-05-25 | 2022-06-30 | — | Ratified |
| Dominican Republic | 1996-10-03 | 2007-09-04 | — | Ratified |
| Ecuador | 1996-09-24 | 2001-11-12 | — | Ratified |
| Egypt | 1996-10-14 | — | — | Signed, not ratified |
| El Salvador | 1996-09-24 | 1998-09-11 | — | Ratified |
| Equatorial Guinea | 1996-10-09 | 2022-09-21 | — | Ratified |
| Eritrea | 2003-11-11 | 2003-11-11 | — | Ratified |
| Estonia | 1996-11-20 | 1999-08-13 | — | Ratified |
| Eswatini | 1996-09-24 | 2016-09-21 | — | Ratified |
| Ethiopia | 1996-09-25 | 2006-08-08 | — | Ratified |
| Fiji | 1996-09-24 | 1996-10-10 | — | Ratified |
| Finland | 1996-09-24 | 1999-01-15 | — | Ratified |
| France | 1996-09-24 | 1998-04-06 | — | Ratified |
| Gabon | 1996-10-07 | 2000-09-20 | — | Ratified |
| Gambia | 2003-04-09 | 2022-03-24 | — | Ratified |
| Georgia | 1996-09-24 | 2002-09-27 | — | Ratified |
| Germany | 1996-09-24 | 1998-08-20 | — | Ratified |
| Ghana | 1996-10-03 | 2011-06-14 | — | Ratified |
| Greece | 1996-09-24 | 1999-04-21 | — | Ratified |
| Grenada | 1996-10-10 | 1998-08-19 | — | Ratified |
| Guatemala | 1999-09-20 | 2012-01-12 | — | Ratified |
| Guinea | 1996-10-03 | 2011-09-22 | — | Ratified |
| Guinea-Bissau | 1997-04-11 | 2013-09-24 | — | Ratified |
| Guyana | 2000-09-07 | 2001-03-07 | — | Ratified |
| Haiti | 1996-09-24 | 2005-12-01 | — | Ratified |
| Holy SeeNon-UN member | 1996-09-24 | 2001-07-18 | — | Ratified |
| Honduras | 1996-09-25 | 2003-10-30 | — | Ratified |
| Hungary | 1996-09-25 | 1999-07-13 | — | Ratified |
| Iceland | 1996-09-24 | 2000-06-26 | — | Ratified |
| India | — | — | — | No action |
| Indonesia | 1996-09-24 | 2012-02-06 | — | Ratified |
| Iran | 1996-09-24 | — | — | Signed, not ratified |
| Iraq | 2008-08-19 | 2013-09-26 | — | Ratified |
| Ireland | 1996-09-24 | 1999-07-15 | — | Ratified |
| Israel | 1996-09-25 | — | — | Signed, not ratified |
| Italy | 1996-09-24 | 1999-02-01 | — | Ratified |
| Jamaica | 1996-11-11 | 2001-11-13 | — | Ratified |
| Japan | 1996-09-24 | 1997-07-08 | — | Ratified |
| Jordan | 1996-09-26 | 1998-08-25 | — | Ratified |
| Kazakhstan | 1996-09-30 | 2002-05-14 | — | Ratified |
| Kenya | 1996-11-14 | 2000-11-30 | — | Ratified |
| Kiribati | 2000-09-07 | 2000-09-07 | — | Ratified |
| Kuwait | 1996-09-24 | 2003-05-06 | — | Ratified |
| Kyrgyzstan | 1996-10-08 | 2003-10-02 | — | Ratified |
| Lao People's Democratic Republic | 1997-07-30 | 2000-10-05 | — | Ratified |
| Latvia | 1996-09-24 | 2001-11-20 | — | Ratified |
| Lebanon | 2005-09-16 | 2008-11-21 | — | Ratified |
| Lesotho | 1996-09-30 | 1999-09-14 | — | Ratified |
| Liberia | 1996-10-01 | 2009-08-17 | — | Ratified |
| Libya | 2001-11-13 | 2004-01-06 | — | Ratified |
| Liechtenstein | 1996-09-27 | 2004-09-21 | — | Ratified |
| Lithuania | 1996-10-07 | 2000-02-07 | — | Ratified |
| Luxembourg | 1996-09-24 | 1999-05-26 | — | Ratified |
| Madagascar | 1996-10-09 | 2005-09-15 | — | Ratified |
| Malawi | 1996-10-09 | 2008-11-21 | — | Ratified |
| Malaysia | 1998-07-23 | 2008-01-17 | — | Ratified |
| Maldives | 1997-10-01 | 2000-09-07 | — | Ratified |
| Mali | 1997-02-18 | 1999-08-04 | — | Ratified |
| Malta | 1996-09-24 | 2001-07-23 | — | Ratified |
| Marshall Islands | 1996-09-24 | 2009-10-28 | — | Ratified |
| Mauritania | 1996-09-24 | 2003-04-30 | — | Ratified |
| Mauritius | — | — | — | No action |
| Mexico | 1996-09-24 | 1999-10-05 | — | Ratified |
| Micronesia | 1996-09-24 | 1997-07-25 | — | Ratified |
| Monaco | 1996-10-01 | 1998-12-18 | — | Ratified |
| Mongolia | 1996-10-01 | 1997-08-08 | — | Ratified |
| Montenegro | 2006-10-23 | 2006-10-23(Succession) | — | Ratified |
| Morocco | 1996-09-24 | 2000-04-17 | — | Ratified |
| Mozambique | 1996-09-26 | 2008-11-04 | — | Ratified |
| Myanmar | 1996-11-25 | 2016-09-21 | — | Ratified |
| Namibia | 1996-09-24 | 2001-06-29 | — | Ratified |
| Nauru | 2000-09-08 | 2001-11-12 | — | Ratified |
| Nepal | 1996-10-08 | — | — | Signed, not ratified |
| Netherlands | 1996-09-24 | 1999-03-23 | — | Ratified |
| New Zealand | 1996-09-27 | 1999-03-19 | — | Ratified |
| Nicaragua | 1996-09-24 | 2000-12-05 | — | Ratified |
| Niger | 1996-10-03 | 2002-09-09 | — | Ratified |
| Nigeria | 2000-09-08 | 2001-09-27 | — | Ratified |
| NiueNon-UN member | 2012-04-09 | 2014-03-04 | — | Ratified |
| North Macedonia | 1998-10-29 | 2000-03-14 | — | Ratified |
| Norway | 1996-09-24 | 1999-07-15 | — | Ratified |
| Oman | 1999-09-23 | 2003-06-13 | — | Ratified |
| Pakistan | — | — | — | No action |
| Palau | 2003-08-12 | 2007-08-01 | — | Ratified |
| Panama | 1996-09-24 | 1999-03-23 | — | Ratified |
| Papua New Guinea | 1996-09-25 | 2024-03-13 | — | Ratified |
| Paraguay | 1996-09-25 | 2001-10-04 | — | Ratified |
| Peru | 1996-09-25 | 1997-11-12 | — | Ratified |
| Philippines | 1996-09-24 | 2001-02-23 | — | Ratified |
| Poland | 1996-09-24 | 1999-05-25 | — | Ratified |
| Portugal | 1996-09-24 | 2000-06-26 | — | Ratified |
| Qatar | 1996-09-24 | 1997-03-03 | — | Ratified |
| Republic of Korea | 1996-09-24 | 1999-09-24 | — | Ratified |
| Moldova | 1997-09-24 | 2007-01-16 | — | Ratified |
| Romania | 1996-09-24 | 1999-10-05 | — | Ratified |
| Russian Federation | 1996-09-24 | — | — | Signed, not ratified |
| Rwanda | 2004-11-30 | 2004-11-30 | — | Ratified |
| Samoa | 1996-10-09 | 2002-09-27 | — | Ratified |
| San Marino | 1996-10-07 | 2002-03-12 | — | Ratified |
| Sao Tome and Principe | 1996-09-26 | 2022-09-22 | — | Ratified |
| Saudi Arabia | — | — | — | No action |
| Senegal | 1996-09-26 | 1999-06-09 | — | Ratified |
| Serbia | 2001-06-08 | 2004-05-19 | — | Ratified |
| Seychelles | 1996-09-24 | 2004-04-13 | — | Ratified |
| Sierra Leone | 2000-09-08 | 2001-09-17 | — | Ratified |
| Singapore | 1999-01-14 | 2001-11-10 | — | Ratified |
| Slovakia | 1996-09-30 | 1998-03-03 | — | Ratified |
| Slovenia | 1996-09-24 | 1999-08-31 | — | Ratified |
| Solomon Islands | 1996-10-03 | 2023-01-20 | — | Ratified |
| Somalia | 2023-09-08 | — | — | Signed, not ratified |
| South Africa | 1996-09-24 | 1999-03-30 | — | Ratified |
| South Sudan | — | — | — | No action |
| Spain | 1996-09-24 | 1998-07-31 | — | Ratified |
| Sri Lanka | 1996-10-24 | 2023-07-25 | — | Ratified |
| Saint Kitts and Nevis | 2004-03-23 | 2005-04-27 | — | Ratified |
| Saint Lucia | 1996-10-04 | 2001-04-05 | — | Ratified |
| Saint Vincent and the Grenadines | 2009-07-02 | 2009-09-23 | — | Ratified |
| Sudan | 2004-06-10 | 2004-06-10 | — | Ratified |
| Suriname | 1997-01-14 | 2006-02-07 | — | Ratified |
| Sweden | 1996-09-24 | 1998-12-02 | — | Ratified |
| Switzerland | 1996-09-24 | 1999-10-01 | — | Ratified |
| Syrian Arab Republic | — | — | — | No action |
| Tajikistan | 1996-10-07 | 1998-06-10 | — | Ratified |
| Thailand | 1996-11-12 | 2018-09-25 | — | Ratified |
| Timor-Leste | 2008-09-26 | 2022-08-01 | — | Ratified |
| Togo | 1996-10-02 | 2004-07-02 | — | Ratified |
| Tonga | 2026-07-07 | 2026-07-07 | — | Ratified |
| Trinidad and Tobago | 2009-10-08 | 2010-05-26 | — | Ratified |
| Tunisia | 1996-10-16 | 2004-09-23 | — | Ratified |
| Turkmenistan | 1996-09-24 | 1998-02-20 | — | Ratified |
| Tuvalu | 2018-09-25 | 2022-03-31 | — | Ratified |
| Türkiye | 1996-09-24 | 2000-02-16 | — | Ratified |
| Uganda | 1996-11-07 | 2001-03-14 | — | Ratified |
| Ukraine | 1996-09-27 | 2001-02-23 | — | Ratified |
| United Arab Emirates | 1996-09-25 | 2000-09-18 | — | Ratified |
| United Kingdom | 1996-09-24 | 1998-04-06 | — | Ratified |
| United Republic of Tanzania | 2004-09-30 | 2004-09-30 | — | Ratified |
| United States of America | 1996-09-24 | — | — | Signed, not ratified |
| Uruguay | 1996-09-24 | 2001-09-21 | — | Ratified |
| Uzbekistan | 1996-10-03 | 1997-05-29 | — | Ratified |
| Vanuatu | 1996-09-24 | 2005-09-16 | — | Ratified |
| Venezuela | 1996-10-03 | 2002-05-13 | — | Ratified |
| Viet Nam | 1996-09-24 | 2006-03-10 | — | Ratified |
| Yemen | 1996-09-30 | — | — | Signed, not ratified |
| Zambia | 1996-12-03 | 2006-02-23 | — | Ratified |
| Zimbabwe | 1999-10-13 | 2019-02-13 | — | Ratified |