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Entered into force May 18, 1972.

In accordance with Article X, paragraph 2, the Treaty shall be subject to ratification by signatory States and instruments of ratification and instruments of accession shall be deposited with the designated Depositary Governments [Russian Federation, United Kingdom, United States]. In accordance with Article X, paragraph 3, the Treaty entered into force after the deposit of instruments of ratification by 22 Governments, including the Governments designated as Depositary Governments of the Treaty. In accordance with Article X, paragraph 4, for States whose instruments of ratification or accession are deposited subsequent to the entry into force of the Treaty, it shall enter into force on the date of deposit of their instruments of ratification or accession.

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U.S. Department of State

The Lessons of 1989: Freedom and Our Future