The present Treaty is open to the accession of other states, irrespective of their social and political systems, which express their readiness by participation in the present Treaty to assist in uniting the efforts of the peaceable states in safeguarding the peace and security of the peoples. Such accession shall enter into force with the agreement of the Parties to the Treaty after the declaration of accession has been deposited with the Government of the Polish People's Republic.
The present Treaty is subject to ratification, and the instruments of ratification shall be deposited with the Government of the Polish People's Republic.
The Treaty shall enter into force on the day the last instrument of ratification has been deposited. The Government of the Polish People's Republic shall notify the other Parties to the Treaty as each instrument of ratification is deposited.
The present Treaty shall remain in force for twenty years. For such Contracting Parties as do not at least one year before the expiration of this period present to the Government of the Polish People's Republic a statement of denunciation of the Treaty, it shall remain in force for the next ten years.
Should a system of collective security be established in Europe, and a General European Treaty of Collective Security concluded for this purpose, for which the Contracting Parties will unswervingly strive, the present Treaty shall cease to be operative from the day the General European Treaty enters into force.
Done in Warsaw on May 14, 1955, in one copy each in the Russian, Polish, Czech and German languages, all texts being equally authentic. Certified copies of the present Treaty shall be sent by the Government of the Polish People's Republic to all the Parties to the Treaty.
In witness whereof the plenipotentiaries have signed the present Treaty and affixed their seals.
Source: The Warsaw Security Pact (May 14, 1955), in American Foreign Policy, 1950-1955. Basic Documents, vol 1. Washington, DC: Government Printing Office, 1957.