6, key topic 5 - Thaw and détente, 1963–72
The Cuban Missile Crisis did not end the Cold War, but it changed the way the superpowers managed danger. From 1963 to 1972 the United States and the Soviet Union still competed, still armed themselves, and still backed rival sides in world politics. Yet they also began to accept that unlimited confrontation could become too costly or too dangerous.
This lesson follows the "thaw" from small confidence-building measures to the more deliberate policy of détente: an easing of tension. The key judgement is not "Did the Cold War end?" It did not. The sharper question is: how far had the superpowers learned to control their rivalry by 1972?
Why The Thaw Began
In 1962 the Cuban Missile Crisis showed both superpowers how quickly a Cold War confrontation could become a nuclear crisis. One reason the crisis was so dangerous was communication. Messages between Washington and Moscow could take hours to transmit, translate, and interpret. In a nuclear confrontation, delay and misunderstanding could be fatal.
That helps explain why the first steps in the thaw were limited and practical. The United States and the Soviet Union did not suddenly trust each other. They accepted that some rules and channels of communication could make competition less likely to become accidental war.
There is an important distinction here:
| Term | Meaning in this lesson | What it did not mean |
|---|---|---|
| Thaw | Early easing of tension after the worst crisis years | Friendship between the superpowers |
| Détente | A more deliberate policy of reducing tension, especially through negotiation | The end of ideological rivalry |
| Arms control | Agreements to limit or manage weapons | Full disarmament |
The first cause of the thaw was therefore fear: both sides had seen the possible consequence of nuclear brinkmanship. But fear alone was not enough. Agreements were possible only when they served each side's interests. The United States wanted to reduce the risk of miscalculation and control the costs of the arms race. The Soviet Union wanted equal recognition as a superpower and a more stable relationship with its main rival.
This is why the thaw should be seen as cautious. It was a change in method, not a change in the basic Cold War division.
Early Agreements, 1963-70
The early thaw was built through several agreements. Each one reduced a particular risk, but none removed the Cold War itself.
| Date | Agreement | What it did | Why it mattered |
|---|---|---|---|
| June-August 1963 | Washington-Moscow "Hotline" | Created a direct communications link between the two governments. The first system was not a red telephone; it used teleprinter links. | It reduced the danger that delay or misunderstanding would turn a crisis into nuclear war. |
| August-October 1963 | Limited Test Ban Treaty | Banned nuclear tests in the atmosphere, in outer space, and underwater, but not underground. | It reduced radioactive fallout and created a precedent for later arms-control agreements. |
| 1967 | Outer Space Treaty | Set rules for outer space and banned nuclear weapons or other weapons of mass destruction in orbit or on celestial bodies. | It limited the spread of the arms race into one especially dangerous arena. |
| 1968-70 | Nuclear Non-Proliferation Treaty | Opened for signature in 1968 and entered into force in 1970. It aimed to stop the wider spread of nuclear weapons, support peaceful nuclear technology, and encourage nuclear disarmament. | The superpowers had a shared interest in preventing more states from becoming nuclear powers. |
The chronology matters. The Hotline and Limited Test Ban Treaty came almost immediately after Cuba, when fear of accidental nuclear war was strongest. The Outer Space Treaty and NPT came later in the 1960s, when the superpowers were thinking beyond one crisis and trying to create wider rules for dangerous technology.
The limits also matter. The Limited Test Ban Treaty did not stop underground nuclear testing. The NPT did not require immediate elimination of existing arsenals, although Article VI committed parties to good-faith negotiations on ending the arms race and nuclear disarmament. The Outer Space Treaty did not end the space race or ban every military use of space. These agreements managed rivalry; they did not abolish it.
A strong explanation therefore avoids exaggeration:
These agreements were significant because they showed that the superpowers could cooperate where mutual survival was at stake. However, they were limited because they mainly reduced specific risks rather than ending the arms race or resolving ideological conflict.
Reasons For Détente
By the late 1960s, détente became more than a few emergency precautions. It became a strategy. The causes were mixed: some came from fear, some from cost, and some from changing world politics.
Détente
Détente means an easing of tension. In the Cold War it describes the period of improved US–Soviet relations and arms agreements in the late 1960s and 1970s.
One reason was the expense and danger of the nuclear arms race. The Soviet Union expanded its intercontinental ballistic missile forces, and both sides considered anti-ballistic missile systems. ABMs sounded defensive, but they could be destabilising. If one side believed it could block the other's retaliation, it might be more willing to risk a first strike. Limiting both offensive and defensive systems could therefore make nuclear rivalry more predictable.
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