Nonproliferation

Signed at Moscow May 26, 1972
Ratification advised by U.S. Senate August 3, 1972
Ratified by U.S. President September 30, 1972
Proclaimed by U.S. President October 3, 1972
Instruments 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 negotiations 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
disarma-ment, and general and complete disarmament,

Desiring to contribute to the relaxation of international tension and the strengthening of
trust between States,

Have agreed as follows:

Article I

1. Each Party undertakes to limit anti-ballistic missile (ABM) systems and to adopt other
measures in accordance with the provisions of this Treaty.

2. 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.

Article II

1. 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:

(a) ABM interceptor missiles, which are interceptor missiles constructed and deployed
for an ABM role, or of a type tested in an ABM mode;

(b) ABM launchers, which are launchers constructed and deployed for launching ABM
interceptor missiles; and

(c) ABM radars, which are radars constructed and deployed for an ABM role, or of a
type tested in an ABM mode.

2. The ABM system components listed in paragraph 1 of this Article include those which
are:

(a) operational;

(b) under construction;

(c) undergoing testing;

(d) undergoing overhaul, repair or conversion; or

(e) mothballed.

Article III

Each Party undertakes not to deploy ABM systems or their components except that:

(a) within one ABM system deployment area having a radius of one hundred and fifty
kilometers and centered on the Partys 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

(b) 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, (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.

Article IV

The limitations provided for in Article III 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.

Article V

1. 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.

2. 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 a capacity, not to develop, test, or deploy automatic or
semi-automatic or other similar systems for rapid reload of ABM launchers.

Article VI

To enhance assurance of the effectiveness of the limitations on ABM systems and their
components provided by the Treaty, each Party undertakes:

(a) 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

(b) 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.

Article VII

Subject to the provisions of this Treaty, modernization and replacement of ABM systems
or their components may be carried out.

Article VIII

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.

Article IX

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.

Article X

Each Party undertakes not to assume any international obligations which would conflict
with this Treaty.

Article XI

The Parties undertake to continue active negotiations for limitations on strategic offensive
arms.

Article XII

1. For the purpose of providing assurance or 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.

2. 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.

3. 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.

Article XIII

1. 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:

(a) consider questions concerning compliance with the obligations assumed and related
situations which may be considered ambiguous;

(b) provide on a voluntary basis such information as either Party considers necessary to
assure confidence in compliance with the obligations assumed;

(c) consider questions involving unintended interference with national technical means of
verification;

(d) consider possible changes in the strategic situation which have a bearing on the
provisions of this Treaty;

(e) 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;

(f) 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;

(g) consider, as appropriate, proposals for further measures aimed at limiting strategic
arms.

2. The Parties through consultation shall establish, and may amend as appropriate,
Regulations for the Standing Consultative Commission governing procedures, composition and
other relevant matters.

Article XIV

1. 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.

2. 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.

Article XV

1. This Treaty shall be of unlimited duration.

2. 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 to 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.

Article XVI

1. 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.

2. 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 the English and Russian
languages, both texts being equally authentic.

FOR THE UNITED STATES OF AMERICA:
RICHARD NIXON
President of the United States of America

FOR THE UNION OF SOVIET SOCIALIST REPUBLICS:
L. I. BREZHNEV
General Secretary of the Central Committee of the CPSU