Strategic Arms Limitation

Introduction

Strategic Arms Limitation refers primarily to the negotiations between the United States and the Soviet Union during the Cold War to restrict the growth of their strategic nuclear arsenals. These negotiations became known as the Strategic Arms Limitation Talks, or SALT.

The development of increasingly powerful nuclear weapons, intercontinental ballistic missiles and submarine-launched missiles had created a dangerous strategic competition. Both superpowers possessed the ability to inflict devastating destruction on each other. The Cuban Missile Crisis of 1962 had demonstrated the danger of allowing nuclear rivalry to escalate without reliable communication or agreed limits.

The SALT process represented an important effort to manage the nuclear arms race. It did not eliminate nuclear weapons, but it established agreements that restricted certain weapons systems and encouraged further negotiations on strategic stability.

1. Background: The Need for Arms Limitation

By the late 1960s, the United States and the Soviet Union had developed extensive nuclear arsenals.

Both possessed strategic bombers, land-based ballistic missiles and submarine-launched ballistic missiles. Technological advances allowed missiles to carry multiple independently targetable re-entry vehicles (MIRVs), increasing the number of warheads that could be delivered by individual missiles.

The competition created several dangers:

• The possibility of a devastating nuclear exchange.
• Pressure to develop increasingly sophisticated weapons.
• High military and economic expenditure.
• The risk of miscalculation during an international crisis.
• Instability caused by uncertainty about the other side’s military capabilities.

Both governments recognised that strategic competition needed to be managed. They therefore began negotiations to place limits on important categories of nuclear weapons.

2. Beginning of the SALT Negotiations

The Strategic Arms Limitation Talks began in Helsinki in November 1969.

The negotiations involved the United States and the Soviet Union and focused on strategic offensive weapons and missile defence systems.

American President Richard Nixon and Soviet leader Leonid Brezhnev supported the process. Henry Kissinger played an important role in American strategic diplomacy.

The negotiations were difficult because both sides wanted to protect their security interests and preserve their strategic advantages.

They nevertheless reached agreement in May 1972, when Nixon visited Moscow.

3. SALT I: The 1972 Agreements

The first round of negotiations produced two principal agreements.

A. Anti-Ballistic Missile Treaty

The Anti-Ballistic Missile Treaty restricted the development and deployment of strategic missile defence systems.

Its purpose was to prevent either superpower from building an extensive defensive shield that could undermine the other’s ability to retaliate.

The treaty initially permitted each side to maintain two ABM deployment areas. A 1974 protocol reduced this to one permitted site for each country.

The treaty reflected the strategic logic of deterrence: if both sides remained vulnerable to retaliation, neither could expect to escape the consequences of launching a nuclear attack.

B. Interim Agreement on Strategic Offensive Arms

The Interim Agreement placed limits on certain categories of American and Soviet strategic ballistic missile launchers.

It established ceilings on land-based intercontinental ballistic missile launchers and submarine-launched ballistic missile launchers, with different limits for the two countries.

The agreement did not impose comprehensive limits on all strategic nuclear weapons. In particular, it did not fully restrict the number of warheads carried by missiles or the development of new technologies such as MIRVs.

Nevertheless, it represented the first major negotiated limitation of strategic nuclear delivery systems between the two superpowers.

4. Significance and Limitations of SALT I

SALT I was an important achievement in arms control.

It established that the United States and Soviet Union could negotiate limits on weapons systems central to their national security. It also created a framework for continued diplomatic engagement.

However, the agreements had significant limitations.

First, they did not reduce the total number of nuclear warheads. Second, they did not prevent technological improvements that increased the destructive capacity of existing systems. Third, the Interim Agreement was temporary and did not provide a comprehensive solution to the nuclear arms race.

The superpowers therefore continued to develop and modernise their strategic forces.

5. SALT II Negotiations

The second round of Strategic Arms Limitation Talks began in November 1972.

The objective was to establish a more comprehensive framework for limiting strategic offensive weapons.

Negotiations addressed issues such as:

• Limits on strategic nuclear delivery vehicles.
• Restrictions on certain types of new missile systems.
• The treatment of multiple-warhead missiles.
• Verification and monitoring arrangements.
• The need to maintain a stable strategic balance.

The negotiations were complicated by technological developments, disputes over counting rules and disagreements about the military balance.

After years of discussions, President Jimmy Carter and Soviet leader Leonid Brezhnev signed the SALT II Treaty in Vienna on 18 June 1979.

6. SALT II Treaty

SALT II sought to place an overall ceiling on strategic nuclear delivery vehicles and introduced additional restrictions on certain categories of weapons.

It included provisions addressing multiple-warhead missiles and established rules intended to limit the development and deployment of particular strategic systems.

The treaty was designed to build on SALT I and create a more comprehensive framework for strategic arms limitation.

However, its political future was damaged by the Soviet invasion of Afghanistan in December 1979.

President Carter asked the United States Senate to postpone consideration of the treaty. The Senate never gave its formal advice and consent to ratification.

Although the treaty did not enter into force, both countries stated that they would generally observe its central limits for a period, subject to their respective policies and circumstances.

7. Verification and Confidence-Building

Arms-control agreements require reliable methods of determining whether states are complying with their commitments.

The SALT agreements recognised the importance of verification through national technical means, including satellite observation and other intelligence capabilities.

The agreements also included provisions intended to prevent deliberate interference with verification systems.

Verification was essential because neither superpower was willing to depend entirely on the other’s assurances.

This experience helped establish principles that influenced later arms-control negotiations.

8. Impact on the Cold War

The SALT process influenced international relations in several ways.

Strategic stability: By placing limits on selected weapons systems, the agreements reduced some incentives for unrestricted competition.

Diplomatic cooperation: Regular negotiations encouraged communication between the superpowers.

Nuclear risk reduction: Arms limitation helped create a more predictable strategic environment, although it did not eliminate the danger of nuclear war.

Political symbolism: The agreements demonstrated that ideological rivals could negotiate on matters of vital national security.

Continuing competition: The limitations were incomplete, and both sides continued to modernise their arsenals.

The SALT process was therefore a significant but limited achievement.

9. From SALT to Later Arms-Control Agreements

The SALT negotiations established a foundation for subsequent arms-control efforts.

In the 1980s, the United States and Soviet Union entered new negotiations concerning strategic and intermediate-range nuclear weapons.

The Intermediate-Range Nuclear Forces (INF) Treaty, signed in 1987, eliminated an entire category of American and Soviet ground-launched missiles with ranges between 500 and 5,500 kilometres.

Later strategic arms agreements, including START I in 1991, sought deeper reductions rather than merely limiting the growth of nuclear arsenals.

These developments reflected the evolution of arms control from managing competition towards reducing deployed nuclear forces.

Conclusion

Strategic Arms Limitation was a major diplomatic effort to manage the nuclear rivalry between the United States and the Soviet Union.

SALT I, signed in 1972, established limits on strategic missile launchers and restricted anti-ballistic missile systems. SALT II, signed in 1979, sought broader limits but never entered into force because of deteriorating political relations following the Soviet invasion of Afghanistan.

Although SALT did not end the nuclear arms race, it established important principles of negotiation, verification and strategic restraint. Its historical significance lies in demonstrating that even intense strategic rivals could agree on measures to reduce the risks of nuclear confrontation.

Key Takeaways

1. SALT stands for Strategic Arms Limitation Talks.
2. The negotiations involved the United States and the Soviet Union.
3. The talks began in Helsinki in November 1969.
4. Nuclear competition and the danger of war encouraged arms limitation.
5. Richard Nixon, Henry Kissinger and Leonid Brezhnev played important roles.
6. SALT I produced two major agreements in 1972.
7. The ABM Treaty restricted strategic missile defence systems.
8. The SALT I Interim Agreement limited certain ballistic missile launchers.
9. SALT I did not comprehensively limit nuclear warheads.
10. SALT II negotiations began in 1972.
11. The SALT II Treaty was signed in Vienna on 18 June 1979.
12. The Soviet invasion of Afghanistan damaged the treaty’s prospects.
13. SALT II was never ratified by the United States Senate.
14. Verification arrangements were essential to arms control.
15. The SALT process helped prepare the way for later agreements, including the INF Treaty and START I.

Review Questions

1. What was the purpose of the Strategic Arms Limitation Talks?
2. Why did the United States and Soviet Union seek to limit strategic weapons?
3. When and where did SALT negotiations begin?
4. What were the principal agreements produced by SALT I?
5. Explain the purpose of the Anti-Ballistic Missile Treaty.
6. What were the limitations of the SALT I Interim Agreement?
7. What were the principal objectives of SALT II?
8. Why was SALT II not ratified by the United States?
9. Why are verification arrangements essential in arms-control agreements?
10. How did SALT influence strategic stability?
11. Explain the relationship between SALT and the later INF Treaty.
12. Assess the achievements and limitations of strategic arms limitation.

Further Reading

• Office of the Historian – US Department of State
• United Nations Office for Disarmament Affairs
• Arms Control Association
• National Security Archive