Treaty Between the United States of America and the Union of Soviet Socialist Republics on the Limitation of Anti-Ballistic Missile Systems
Signed at Moscow May 26, 1972
Ratification advised by the U.S. Senate August 3, 1972
Ratified by the U.S. President September 30, 1972
Proclaimed by the U.S. President October 3, 1972
Instrument of ratification exchanged October 3, 1972
Entered into force October 3, 1972
The United States of America and the Union of Soviet Socialist Republics, hereinafter referred to as the Parties,
Proceeding from the premise that nuclear war would have devastating consequences for all mankind,
Considering that effective measures to limit anti-ballistic missile systems would be a substantial factor in curbing the race in strategic offensive arms and would lead to a decrease in the risk of outbreak of war involving nuclear weapons,
Proceeding from the premise that the limitation of anti-ballistic missile systems , as well as certain agreed measures with respect to the limitation of strategic offensive arms, would contribute to the creation of more favorable conditions for further negotiation on limiting strategic arms,
Mindful of their obligations under Article VI of the Treaty on the Non-Proliferation of Nuclear Weapons,
Declaring their intention to achieve at the earliest possible date the cessation of the nuclear arms race and to take effective measures toward reductions in strategic arms, nuclear disarmament, and to general and complete disarmament,
Desiring to contribute to the relaxation of international tension and then strengthening of trust between States,
Have agreed as follows:
- Each Party undertakes to limit anti-ballistic missile (ABM) systems and to adopt other measures in accordance with the provisions of this Treaty.
- Each Party undertakes not to deploy ABM systems for a defense of the territory of its country and not to provide a base for such a defense, and not to deploy ABM systems for defense of an individual region except as provided for in Article III of this Treaty.
The ABM system components listed in paragraph 1 of this Article include those which are:
- For the purpose of this Treaty an ABM system is a system to counter strategic ballistic missiles or their elements in flight trajectory, currently consisting of:
- ABM interceptor missiles, which are interceptor missiles constructed and deployed for an ABM role, or of a type tested in an ABM mode;
- ABM launchers, which are launchers constructed and deployed for launching ABM interceptor missiles; and
- ABM radars, which are radars constructed and deployed for an ABM role, or of a type tested in an ABM mode.
- under construction;
- undergoing tests;
- undergoing overhaul; repair or conversion; or
Each Party undertakes not to deploy ABM systems or their components except that:
- within one ABM system deployment area having a radius of one hundred and fifty kilometers and centered on the Party's national capital,
a Party may deploy: (1) no more than one hundred ABM launchers and no more than one hundred ABM interceptor missiles at launch sites,
and (2) ABM radars within no more than six ABM radar complexes, the area of each complex being circular and having a diameter of no more than
three kilometers; and
- within one ABM system deployment area having a radius of one hundred and fifty kilometers and containing ICBM silo launchers, a Party
may deploy: (1) no more than one hundred ABM launchers and no more than one hundred ABM interceptor missiles at launch sites,
and (2) two large phased-array ABM radars comparable in potential to corresponding ABM radars operational or under construction on the date of signature
of the Treaty in an ABM system deployment area containing ICBM silo launchers, and (3) no more than eighteen ABM radars each having a potential
less than the potential of the smaller of the above-mentioned two large phased-array ABM radars.
The limitations provided for in Article II shall not apply to ABM systems or their components used for development or testing, and located within
current or additionally agreed test ranges. Each Party may have no more than a total of fifteen ABM launchers at test ranges.
- Each Party undertakes not to develop, test, or deploy ABM systems or components which are sea-based, air-based, space-based, or mobile land-based.
- Each Party undertakes not to develop, test, or deploy ABM launchers for launching more than one ABM interceptor missile at a time from each launcher,
not to modify deployed launchers to provide them with such capability, not to develop, test, or deploy automatic or semi-automatic or other similar systems
for rapid reload of ABM launchers.
To enhance assurance of the effectiveness of the limitations on ABM systems and their components provided by the Treaty, each Party undertakes:
- not to give missiles, launchers, or radars, other than ABM interceptor missiles, ABM launchers, or ABM radars, capabilities to counter strategic
ballistic missiles or their elements in flight trajectory, and not to test them in an ABM mode; and
- not to deploy in the future radars for early warning of strategic ballistic missile attack except at locations along the periphery of its national territory
and oriented outward.
Subject to the provisions of this Treaty, modernization and replacement of ABM systems or their components may be carried out.
ABM Systems or their components in excess of the numbers or outside the areas specified in this Treaty, as well as ABM systems or their components
prohibited by this Treaty, shall be destroyed or dismantled under agreed procedures within the shortest possible agreed period of time.
To assure the viability and effectiveness of this Treaty, each Party undertakes not to transfer to other States, and not to deploy outside its national territory,
ABM systems or their components limited by this Treaty.
Each Party undertakes not to assume any international obligations which would conflict with this Treaty.
The Parties undertake to continue active negotiations for limitations on strategic offensive arms.
- For the purpose of providing assurance of compliance with the provisions of this Treaty, each Party shall use national technical means
of verification at its disposal in a manner consistent with generally recognized principles of international law.
- Each Party undertakes not to interfere with the national technical means of verification of the other Party operating in accordance with paragraph
1 of this Article.
- Each Party undertakes not to use deliberate concealment measures which impede verification by national technical means of compliance with the
provisions of this Treaty. This obligation shall not require changes in current construction, assembly, conversion, or overhaul practices.
The Parties through consultation shall establish, and may amend as appropriate, Regulations for the Standing Consultative Commission governing
procedures, composition, and other relevant matters.
- To promote the objectives and implementation of the provisions of this Treaty, the Parties shall establish promptly a Standing Consultative Commission,
within the framework of which they will:
- consider questions concerning compliance with the obligations assumed and related situations which may be considered ambiguous;
- provide on a voluntary basis such information as either Party considers necessary to assure confidence in compliance with the
- consider questions involving unintended interference with national technical means of verification;
- consider possible changes in the strategic situation which have a bearing on the provisions of this Treaty;
- agree upon procedures and dates for destruction or dismantling of ABM systems or their components in cases provided for by the provisions of this Treaty;
- consider, as appropriate, possible proposals for further increasing the viability of this Treaty; including proposals for amendments in accordance with
the provisions of this Treaty;
- consider, as appropriate, proposals for further measures aimed at limiting strategic arms.
- Each Party may propose amendments to this Treaty. Agreed amendments shall enter into force in accordance with the procedures governing the entry into force of this Treaty.
- Five years after entry into force of this Treaty, and at five-year intervals thereafter, the Parties shall together conduct a review of this Treaty.
- This Treaty shall be of unlimited duration.
- Each Party shall, in exercising its national sovereignty, have the right to withdraw from this Treaty if it decides that extraordinary events related to the subject
matter of this Treaty have jeopardized its supreme interests. It shall give notice of its decision ot the other Party six months prior to withdrawal from the Treaty.
Such notice shall include a statement of the extraordinary events the notifying Party regards as having jeopardized its supreme interests.
- This Treaty shall be subject to ratification in accordance with the constitutional procedures of each Party. The Treaty shall enter into force on the day of the
exchange of instruments of ratification.
- This Treaty shall be registered pursuant to Article 102 of the Charter of the United Nations.
DONE at Moscow on May 26, 1972, in two copies, each in English and Russian languages, both texts being equally authentic.
For the United States of America
RICHARD M. NIXON
President of the United States of America
For the Union of Soviet Socialist Republics
General Secretary of the Central Committee of the CPSU
Agreed, Common, and Unilateral ABM Treaty Statements
Protocol to the ABM Treaty