Treaty on the Prohibition of the Emplacement of Nuclear Weapons and Other Weapons of Mass Destruction on the Sea-Bed and the Ocean Floor and in the Subsoil Thereof

Opened for signature at London, Moscow and Washington: 11 February 1971 
 
Entered into force: 18 May 1972 
 
Depositary Governments: Russian Federation, United Kingdom of Great Britain and Northern Ireland and 
United States of America
 
State Signature Deposit Deposit Type
Bulgaria 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
16 April 1971  
7 May 1971  
26 May 1971  
Moscow
Washington
London
Ratification
Ratification
Ratification
Afghanistan 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
22 April 1971  
23 April 1971  
21 May 1971  
Moscow
London
Washington
Ratification
Ratification
Ratification
Mauritius 11 February 1971  
Washington
23 April 1971  
3 May 1971 *
18 May 1971  
Washington
London
Moscow
Ratification
Ratification
Ratification
Malta 11 February 1971  
11 February 1971  
London
Washington
4 May 1971  
Washington
Ratification
Finland 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
8 June 1971  
8 June 1971  
8 June 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Denmark 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
15 June 1971  
15 June 1971  
15 June 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Japan 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
21 June 1971  
21 June 1971  
21 June 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Norway 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
28 June 1971  
28 June 1971  
29 June 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Togo 2 April 1971  
Washington
28 June 1971  
Washington
Ratification
Nepal 11 February 1971  
11 February 1971  
24 February 1971  
Moscow
Washington
London
6 July 1971  
29 July 1971  
9 August 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Morocco 11 February 1971  
11 February 1971  
18 February 1971  
Moscow
Washington
London
26 July 1971  
5 August 1971  
18 January 1972  
London
Washington
Moscow
Ratification
Ratification
Ratification
Niger 11 February 1971  
Washington
9 August 1971  
Washington
Ratification
Swaziland 11 February 1971  
Washington
9 August 1971  
Washington
Ratification
Hungary 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
13 August 1971 *
13 August 1971  
13 August 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Jordan 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
17 August 1971  
30 August 1971  
1 November 1971  
Washington
Moscow
London
Ratification
Ratification
Ratification
Ireland 11 February 1971  
11 February 1971  
London
Washington
19 August 1971  
19 August 1971  
London
Washington
Ratification
Ratification
Iran (Islamic Republic of) 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
26 August 1971  
26 August 1971  
6 September 1971  
London
Washington
Moscow
Ratification
Ratification
Ratification
Ukraine 3 March 1971  
Moscow
3 September 1971  
Moscow
Ratification
Belarus 3 March 1971  
Moscow
14 September 1971  
Moscow
Ratification
Mongolia 11 February 1971  
11 February 1971  
London
Moscow
8 October 1971  
15 November 1981  
Moscow
London
Ratification
Ratification
Lao People's Democratic Republic 11 February 1971  
11 February 1971  
15 February 1971  
London
Washington
Moscow
19 October 1971  
22 October 1971  
3 November 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Tunisia 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
22 October 1971  
28 October 1971  
29 October 1971  
Moscow
London
Washington
Ratification
Ratification
Ratification
Poland 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
15 November 1971  
15 November 1971  
15 November 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Cyprus 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
17 November 1971  
17 November 1971  
30 December 1971  
London
Moscow
Washington
Ratification
Ratification
Ratification
Côte d'Ivoire 14 January 1972  
14 January 1972  
Moscow
Washington
Accession
Accession
Dominican Republic 11 February 1971  
Washington
11 February 1972  
Washington
Ratification
New Zealand 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
24 February 1972  
24 February 1972  
24 February 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Sweden 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
28 April 1972  
28 April 1972  
28 April 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Canada 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
17 May 1972 *
17 May 1972 *
17 May 1972 *
London
Moscow
Washington
Ratification
Ratification
Ratification
Russian Federation 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
18 May 1972 *
18 May 1972  
18 May 1972 *
London
Moscow
Washington
Ratification
Ratification
Ratification
United Kingdom of Great Britain and Northern Ireland 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
18 May 1972 *
18 May 1972 *
18 May 1972 *
London
Moscow
Washington
Ratification
Ratification
Ratification
United States of America 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
18 May 1972  
18 May 1972 *
18 May 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Saint Kitts and Nevis 18 May 1972  
Washington
Ratification
Iceland 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
30 May 1972  
30 May 1972  
30 May 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Malaysia 20 May 1971  
20 May 1971  
20 May 1971  
London
Moscow
Washington
21 June 1972  
21 June 1972  
21 June 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Saudi Arabia 7 January 1972  
Washington
23 June 1972  
Washington
Ratification
Romania 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
10 July 1972 *
10 July 1972  
10 July 1972 *
London
Moscow
Washington
Ratification
Ratification
Ratification
Ghana 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
9 August 1972  
Washington
Ratification
Austria 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
10 August 1972  
10 August 1972  
10 August 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Iraq 22 February 1971  
Moscow
13 September 1972 *
Moscow
Ratification
Zambia 9 October 1972  
1 November 1972  
2 November 1972  
London
Washington
Moscow
Accession
Accession
Accession
Turkey 25 February 1971  
25 February 1971  
25 February 1971  
London
Moscow
Washington
19 October 1972  
25 October 1972  
30 October 1972  
Washington
London
Moscow
Ratification
Ratification
Ratification
Botswana 11 February 1971  
Washington
10 November 1972  
Washington
Ratification
Belgium 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
20 November 1972  
20 November 1972  
20 November 1972  
London
Moscow
Washington
Ratification
Ratification
Ratification
Australia 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
23 January 1973 *
23 January 1973  
23 January 1973  
London
Moscow
Washington
Ratification
Ratification
Ratification
Nicaragua 11 February 1971  
Washington
7 February 1973  
Washington
Ratification
Lesotho 8 September 1971  
Washington
3 April 1973  
Washington
Ratification
India 20 July 1973 *
20 July 1973 *
20 July 1973 *
London
Moscow
Washington
Accession
Accession
Accession
South Africa 11 February 1971  
Washington
14 November 1973  
26 November 1973  
30 November 1973  
Washington
London
Moscow
Ratification
Ratification
Ratification
Panama 11 February 1971  
Washington
20 March 1974  
Washington
Ratification
Italy 11 February 1971  
11 February 1971  
11 February 1971 *
London
Moscow
Washington
3 September 1974 *
3 September 1974 *
3 September 1974  
London
Moscow
Washington
Ratification
Ratification
Ratification
Qatar 12 November 1974  
London
Accession
Rwanda 11 February 1971  
Washington
20 May 1975  
20 May 1975  
20 May 1975  
London
Moscow
Washington
Ratification
Ratification
Ratification
Portugal 24 June 1975  
24 June 1975  
24 June 1975  
London
Moscow
Washington
Accession
Accession
Accession
Germany 8 June 1971 *
8 June 1971 *
8 June 1971  
London
Moscow
Washington
18 November 1975 *
18 November 1975 *
London
Washington
Ratification
Ratification
Netherlands 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
14 January 1976 *
14 January 1976  
14 January 1976 *
London
Moscow
Washington
Ratification
Ratification
Ratification
Switzerland 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
4 May 1976  
4 May 1976  
4 May 1976  
London
Moscow
Washington
Ratification
Ratification
Ratification
Guinea-Bissau 20 August 1976  
Moscow
Accession
Singapore 5 May 1971  
5 May 1971  
5 May 1971  
London
Moscow
Washington
10 September 1976  
10 September 1976  
10 September 1976  
London
Moscow
Washington
Ratification
Ratification
Ratification
Cuba 3 June 1977 *
Moscow
Accession
Ethiopia 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
12 July 1977  
14 July 1977  
14 July 1977  
London
Moscow
Washington
Ratification
Ratification
Ratification
Congo 23 October 1978  
Washington
Accession
Yemen 23 February 1971  
Moscow
1 June 1979  
Moscow
Ratification
Sao Tome and Principe 24 August 1979  
Moscow
Accession
Cape Verde 24 October 1979  
Moscow
Accession
Viet Nam 20 June 1980 *
Moscow
Accession
Solomon Islands 17 June 1981  
London
Succession
Central African Republic 11 February 1971  
Washington
9 July 1981  
Washington
Ratification
Luxembourg 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
11 November 1982  
11 November 1982  
11 November 1982  
London
Moscow
Washington
Ratification
Ratification
Ratification
Argentina 3 September 1971  
3 September 1971  
3 September 1971  
London
Moscow
Washington
21 March 1983 *
21 March 1983 *
21 March 1983 *
London
Moscow
Washington
Ratification
Ratification
Ratification
Mexico 23 March 1984 *
23 March 1984  
23 March 1984 *
London
Moscow
Washington
Accession
Accession
Accession
Seychelles 12 March 1985  
14 March 1985  
8 April 1985  
London
Moscow
Washington
Accession
Accession
Accession
Greece 11 February 1971  
12 February 1971  
Moscow
Washington
28 May 1985 *
28 May 1985  
28 May 1985  
London
Moscow
Washington
Ratification
Ratification
Ratification
Benin 18 March 1971  
Washington
19 June 1986  
2 July 1986  
7 July 1986  
Moscow
London
Washington
Ratification
Ratification
Ratification
Jamaica 11 October 1971  
11 October 1971  
14 October 1971  
London
Washington
Moscow
30 July 1986  
30 July 1986  
30 July 1986  
London
Moscow
Washington
Ratification
Ratification
Ratification
Republic of Korea 11 February 1971  
11 February 1971  
London
Washington
25 June 1987  
25 June 1987  
London
Washington
Ratification
Ratification
Spain 15 July 1987  
15 July 1987  
15 July 1987  
London
Moscow
Washington
Accession
Accession
Accession
Brazil 3 September 1971  
3 September 1971  
3 September 1971 *
London
Moscow
Washington
10 May 1988 *
10 May 1988  
4 August 1988 *
London
Washington
Moscow
Ratification
Ratification
Ratification
Antigua and Barbuda 16 November 1988 *
26 December 1988 *
26 January 1989  
Washington
Moscow
London
Succession
Succession
Succession
Bahamas 7 June 1989  
Washington
Accession
Libya 6 July 1990  
Moscow
Accession
China 28 February 1991 *
28 February 1991  
28 February 1991 *
London
Moscow
Washington
Accession
Accession
Accession
Liechtenstein 30 May 1991  
30 May 1991  
London
Washington
Accession
Accession
Algeria 27 January 1992  
Washington
Accession
Slovenia 7 April 1992  
20 August 1992 *
London
Washington
Succession
Succession
Latvia 24 June 1992  
3 August 1992  
London
Washington
Accession
Accession
Czech Republic 1 January 1993 *
5 April 1993 *
9 April 1993 *
Washington
London
Moscow
Succession
Succession
Succession
Slovakia 1 January 1993 *
17 March 1993 *
25 June 1993 *
Washington
London
Moscow
Succession
Succession
Succession
Philippines 5 November 1993  
London
Accession
Bosnia and Herzegovina 15 August 1994 *
Washington
Succession
Guatemala 11 February 1971  
Washington
1 April 1996  
Washington
Ratification
Saint Vincent and the Grenadines 13 May 1999  
London
Succession
Montenegro 3 June 2006 *
3 June 2006 *
London
Moscow
Succession
Succession
Serbia 3 June 2006 *
3 June 2006 *
London
Moscow
Succession
Succession
Bolivia (Plurinational State of) 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
Burundi 11 February 1971  
11 February 1971  
Moscow
Washington
Cambodia 11 February 1971  
Washington
Cameroon 11 November 1971  
Moscow
Colombia 11 February 1971  
Washington
Costa Rica 11 February 1971  
Washington
Equatorial Guinea 4 June 1971  
Washington
Gambia 18 May 1971  
21 May 1971  
29 October 1971  
London
Moscow
Washington
Guinea 11 February 1971  
11 February 1971  
Moscow
Washington
Honduras 11 February 1971  
Washington
Lebanon 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
Liberia 11 February 1971  
Washington
Madagascar 14 September 1971  
Washington
Mali 11 February 1971  
15 February 1971  
Washington
Moscow
Myanmar 11 February 1971  
11 February 1971  
11 February 1971  
London
Moscow
Washington
Paraguay 23 February 1971  
Washington
Senegal 17 March 1971  
Washington
Sierra Leone 11 February 1971  
12 February 1971  
24 February 1971  
London
Moscow
Washington
Sudan 11 February 1971  
12 February 1971  
London
Moscow
United Republic of Tanzania 11 February 1971  
Washington
Uruguay 11 February 1971  
Washington

* A note, statement, declaration, or reservation, is attached to the signature or depository action. Click on the action date to view the details.

  Glossary of treaty-related terms

Number of Signatory States: 84
Number of States Parties: 94