Détente and the SALT Negotiations

The moment parity arrived and made things more dangerous

What the two delegations that first sat down in Helsinki on 17 November 1969 had to settle was not who held more missiles but why having ever more of them was becoming dangerous. One premise made that agreement thinkable. Only a few years earlier the United States enjoyed overwhelming superiority in strategic bombers and intercontinental ballistic missiles (ICBMs), and the Soviet Union ran its factories on a three-shift basis to close the gap. By the mid-1960s Washington's reconnaissance satellites could confirm that the Soviets had caught up. While the U.S. ICBM force had been capped at 1,054 since 1967, Soviet launchers were growing by hundreds each year, approaching 1,600. The age of strategic parity had arrived, in which no one could win unilaterally by numbers. Parity itself was a foundation for stability, for the first time the logic of assured destruction, the certainty that a survivor could strike back and annihilate the attacker, was settling in between the two superpowers as a 'workable if unpleasant order.'

A Defense That Was Really a Bargaining Chip, and a Freeze That Hid an Imbalance

SALT I was never, at the outset, about reducing nuclear weapons. The purpose of the Safeguard ABM system the Nixon administration asked Congress to fund in spring 1969 was, as Kissinger privately admitted, one for which he had "no military rationale." He and Nixon saw a missile-defense network as a bargaining chip to extract limits on Soviet offensive missiles. The Safeguard budget, which survived a tied Senate vote in August 1969 only on Vice President Spiro Agnew's casting vote, was the real starting point of these negotiations.

What the United States tabled in April 1970 was the product of that bargaining. Offering a minimal ABM limit leaving only a National Command Authority (NCA) site to defend the capital, Nixon and Kissinger expected the Soviet Union to reject it; a rejection would give them the pretext to ask Congress for more Safeguard sites. But the Soviet delegation showed interest, and by August had confirmed this choice. As Defense Secretary Melvin Laird and NSC staffer Helmut Sonnenfeldt worried, if word leaked that the Soviets would accept the most minimal system, the case for more Safeguard funding would collapse. The defensive network offered as a bargaining chip became a liability.

The talks stagnated from the autumn of 1970 over whether U.S. forward-based systems, the tactical nuclear delivery vehicles stationed in NATO Europe, should fall inside a comprehensive agreement. What broke the deadlock was not the official delegation but the White House backchannel Kissinger maintained with Soviet ambassador Anatoly Dobrynin. While Gerard Smith's delegation in Helsinki and Vienna worked the texts article by article, word by word, Nixon and Kissinger maneuvered to claim credit for a summit "breakthrough," fueling bureaucratic friction with Smith's team.

The result signed in Moscow in May 1972 was a finely balanced compromise. The ABM Treaty restricted each side to two sites and banned nationwide territorial defense, effectively burying Safeguard's original purpose. The Interim Agreement froze offensive missile launchers, but the numbers, 1,054 U.S. ICBM launchers against 1,607 Soviet, wrote Soviet superiority into law. In exchange for freezing in place the Soviet edge in ICBMs and submarine-launched missiles, the United States preserved its own advantage in MIRVed warheads and bombers. SALT I was thus less an agreement that stopped the arms race than a bargain that froze rivalry in the fields each side did not like, while leaving each side's favored advantages untouched. By banning defense while accepting an offensive imbalance, its structure already carried the problem détente would spend the next decade failing to solve.

How a Draft Renouncing Nuclear War Was Whittled into a Pledge to Talk

When SALT II opened in Geneva in November 1972, the two sides were really arguing about different problems. The SALT I Interim Agreement had frozen only the number of launchers, not how many warheads each launcher carried. The Soviet Union already fielded larger, heavier ICBMs and had begun fitting MIRVs onto those big missiles. The United States, outnumbered in launchers, led on quality, but once the Soviets closed the MIRV gap America would lose on both count and firepower. So the American delegation's opening demand was a freeze barring any new missile more than 5 percent better than existing ones. Moscow read this as an attempt to block its own modernization, and the deadlock held through the following year.

Beside this stalled negotiation, a separate document was in motion. What the Soviets had first put forward at the 1972 Moscow summit was a draft renouncing first use of nuclear weapons against each other. Kissinger read it as a dangerous ploy. The USSR held the conventional advantage, so if the United States also renounced nuclear first use, NATO's strategy, the extended deterrence that protected its European allies, would collapse. And the moment the two superpowers declared they would not use force against each other, China would take it as the dreaded U.S.-Soviet collusion, a joint effort to isolate third nuclear aspirants. With the help of British diplomat Thomas Brimelow, Kissinger drafted a counterproposal, and after more than a year the original text was turned 180 degrees. The 'unconditional renunciation of nuclear use' the Soviets had wanted was pared down to a nearly non-binding sentence that the objective was peace. Kissinger himself doubted whether it was 'worth the effort' and called the result only 'marginally useful.'

The Agreement on the Prevention of Nuclear War, signed in Washington on June 22, 1973, was born this way. Its eight articles were mostly non-binding pledges, and the 'urgent consultations' of Article IV were a ritual more than an obligation. Yet each side carried away something different. The Soviet Union gained the confirmation that negotiation produced a symbolic document at a summit without a hard-line American delegation, a recognition of superpower condominium. For Kissinger the document meant something else: he judged the text gave him a framework making it impossible for the Soviets to turn on NATO or the Middle East 'without violating the agreement,' and even a kind of legal basis for resisting a Soviet attack on China. The symbolism was large, the effect small. The agreement stopped nothing when war came to the Middle East later that year.

What 'equal numbers' left out, and where trade met emigration

The heart of the Vladivostok agreement was a single word: equality. Over two days, November 23-24, 1974, at the Okeanskaya Sanatorium, a naval resort in the Soviet Far East, Gerald Ford and Leonid Brezhnev settled a framework capping each side's strategic nuclear delivery vehicles (ICBMs, SLBMs, and strategic bombers) at 2,400, with a sub-ceiling of 1,320 for MIRVed systems. Where SALT I had been an 'unequal freeze' that left the Soviets more launchers (1,607 to 1,054), this was the first agreement to bind both sides to the same number. For the Soviets it was a real concession. Dobrynin called it a 'compromise' that eliminated what he judged SALT I's 'principal deficiency', the Soviet numerical edge. The price of surrendering that edge was that Brezhnev barred any American demand to cut Soviet heavy ICBMs. As Gromyko recorded, since the U.S. refused even to discuss its forward-based systems in Western Europe (F-4s, F-111s, FB-111s), the Trident submarines, and the B-1 bomber, a demand that the USSR give up its own missiles simply could not stand. Ford's retreat on that point made the deal possible.

What the number 'equality' concealed was its asymmetry. The 2,400 total simply did not count forward-based systems or the nuclear forces of NATO allies, and the MIRV sub-ceiling favoured an America that had already completed multiple-warhead deployment. The framework froze the American advantage of late 1974 into place, which is why, the moment the talks ended, domestic critics in the U.S. charged that too much had been given to the Soviets, while the Soviet military grumbled that America's qualitative edge had gone unchecked. Kissinger wrote that Vladivostok was 'the only time in Ford's presidency that he would be representing a united position of his government on SALT', and at the same time warned the President that 'the domestic attack on SALT would continue'. The warning came true a little over a month later, though the attack came not from the Senate floor over arms, but over a trade bill.

On January 3, 1975, Ford signed the Trade Act with the Jackson-Vanik amendment attached. The amendment denied most-favoured-nation status and export credits to non-market economies that restricted emigration. Its immediate target was the 'education tax' the Soviets had imposed in the summer of 1972, a steep exit levy on would-be emigrants who had received free higher education; behind it stood American Jewish organisations demanding freer Jewish emigration and the presidential ambition of Senator Henry Jackson, an opponent of détente itself who wielded human rights as a weapon. Through 1974 Jackson conducted a trilateral negotiation with Kissinger and Dobrynin in which Kissinger was, by the testimony of those involved, the only person who knew the positions of all three parties. In the end Jackson chose a written statute over a vague Soviet assurance on emigration.

Moscow's answer was immediate and total. On January 10, 1975, an official note from Brezhnev to Ford declared that the congressional legislation contradicted both the 1972 agreement's principle of 'unconditional elimination of discriminatory restrictions' and the principle of non-interference in each other's domestic affairs, and announced that the Soviet side considered itself 'relieved of those mutual obligations' it had assumed in the 1972 trade and credit accords. It denied ever having given assurances about its internal laws. On January 13, Kissinger confirmed that the 1972 trade agreement could not be brought into force. With nothing left to gain from American trade, Moscow had no remaining incentive to sustain its earlier concessions. As the MGIMO scholars Yungblyud and Ilyin put it, the amendment was the watershed separating 'high détente' from its downward phase, and it remained a lever of U.S. policy until replaced by the Magnitsky Act in 2012. Forty days after the two superpowers agreed on numbers at Vladivostok, the political relaxation that was supposed to underwrite the deal collapsed before two very different realities: a vote in the American Congress and the statistics of Jewish emigration.

The Accusers Helsinki Unleashed, and the Two Years Human Rights Swallowed the Arms Talks

The Helsinki Final Act carried two contradictory promises in a single document. Its first 'basket' affirmed the inviolability of frontiers, confirming the post-1945 territorial order, in other words the spoils the Soviet Union had taken in Eastern Europe; its third 'basket' set out human-rights provisions such as family reunification, emigration, and freedom of information. Brezhnev signed the third to get the first. By Dobrynin's recollection, Brezhnev looked forward to the propaganda value of the Soviet public learning that the postwar borders had been finally settled. Instead the document became a manifesto for the dissident movement. In May 1976 the physicist Yuri Orlov, with ten others, founded the Moscow Helsinki Group and declared, in the words of the text itself, that it would 'monitor compliance with the humanitarian articles of the Helsinki Accords on the territory of the USSR and inform the signatory states of violations.' For the first time in the country's history, the international document the Kremlin had proudly signed was being used as the legal basis for denouncing that same government to the outside world. Arrests began in February 1977: Orlov was sentenced to seven years' hard labour and five years' exile for 'anti-Soviet agitation,' and by that autumn more than fifty Helsinki group members had lost their freedom.

It was at precisely this moment that Jimmy Carter became president, and Carter wanted two things at once: deep cuts in nuclear arms, and human-rights pressure as the emblem of the moral diplomacy he had promised. The problem was that Moscow saw the two as one. In March 1977, a few months into his term, Carter put forward to Moscow a proposal for far deeper reductions than the Vladivostok ceiling of 2,400 delivery vehicles. Unlike his predecessors, Carter announced the proposal publicly before even delivering it to the Soviets. When Secretary of State Vance carried it to Moscow, Gromyko rejected it with an emphatic 'Nyet.' The Soviet leadership read it as a unilateral attempt to discard the carefully balanced Vladivostok framework it had spent years building, and Carter's letter of support to Sakharov and his criticism of Soviet human rights compounded the insult, landing as interference in internal affairs. The telling point is that the rejection did not move Carter. As a result, the signing of SALT II slipped by two years, from 1977 to June 1979.

Those two years were not lost time. The Soviet Union kept deploying its SS-18 heavy ICBMs, and the United States stalled over the cruise missile and the Backfire bomber. What Carter and Brezhnev finally signed in the Hofburg Palace in Vienna in June 1979 was not the 'deep cuts' Carter had promised but a treaty that only slightly refined the Vladivostok skeleton: the ceiling dipped modestly from 2,400 to 2,250 delivery vehicles, while the stubborn core issues, the 308 Soviet heavy ICBMs and the American cruise missiles, were left untouched. The moral opening that had meant to wield human rights as a weapon ended up, because of those very human rights, driving an offended adversary away from the table twice, buying time for both sides to deploy more of the weapons neither wanted to give up. The gift of fixed borders that Helsinki handed the Kremlin became, in the dissidents' hands, the document that ate away at its value, and Carter's human-rights diplomacy, by delaying the arms talks two years, ended up prolonging the very arms race he had set out to end.

What collapsed in Afghanistan was trust, not the treaty text

The Soviet leadership's logic for sending troops into Afghanistan in December 1979 was not the one Washington described as an invasion. After the 1978 revolution, the People's Democratic Party government faced armed revolt in the countryside and deep internal division. Hafizullah Amin removed Nur Muhammad Taraki and purged rivals. From Moscow's perspective, a friendly socialist government on its border might collapse and be replaced by an Islamist opposition or a regime aligned with the United States. As the Politburo documents indicate, the intended aim was to stabilize the government and keep Afghanistan on a friendly course, not to begin a long occupation. Yet that judgment led to the removal of Amin, the installation of Babrak Karmal, and direct Soviet control of Kabul and the main routes. Afghan political autonomy was made to pay for military stability, and a plan for rapid intervention became a ten-year war.

The American response was not simply a decision to abandon the treaty. Until the invasion, the Carter administration expected that Moscow would judge the costs of military intervention too high. When that assumption collapsed, it redefined the event from a regional conflict outside Europe into a test of the Persian Gulf and the global balance of power. Zbigniew Brzezinski urged a hard response, but officials also disagreed over Soviet intentions and the scale of the Afghan crisis. In his letter to Senator Byrd on January 3, 1980, Carter wrote that SALT II remained in “the national security interest of the United States and the entire world.” He did not announce withdrawal. He asked that consideration be deferred so that Congress and the administration could assess Soviet actions and intentions and concentrate first on measures required by the crisis.

That distinction mattered, but it could not undo the political effect. SALT II offered verification and numerical limits for managing the other side's nuclear forces; Afghanistan made the question whether that same opponent would accept risks outside the agreement the central issue. Carter combined sanctions, restrictions on grain sales to the Soviet Union, the boycott of the 1980 Moscow Olympics, and expanded aid to Afghan resistance forces to raise the cost of the intervention. The Soviet Union paid a military and economic price for resisting pressure to withdraw, while Afghan society bore vastly greater destruction and displacement. The two governments largely observed SALT II's limits until 1985, but that did not mean political trust had survived. It meant that a minimal shared interest in avoiding nuclear war remained. The treaty had been signed but not ratified, and arms control changed from evidence of cooperation into a temporary guardrail for managing danger amid renewed confrontation.

What SALT settled, what it left behind, and how to judge it

The most certain achievement of SALT was not a promise to abolish nuclear weapons, but the conversion of competition into rules that could be counted. The 1972 ABM Treaty blocked an unlimited race to expand defenses that might neutralize the other side's retaliatory forces, while the SALT I Interim Agreement froze offensive ballistic-missile launchers at existing levels. SALT II went further. Through 1985 it would have limited each side to 2,250 strategic delivery vehicles, capped the combined total of MIRVed ballistic-missile launchers and heavy bombers equipped with long-range cruise missiles at 1,320, capped all MIRVed ballistic-missile launchers at 1,200, and capped MIRVed ICBM launchers at 820. It recognized national technical means of verification, chiefly reconnaissance satellites, and prohibited deliberate concealment or denial of test information that obstructed verification. The point was not that either side trusted the other completely. It was that each could monitor and challenge the other without relying on trust alone.

That was not the same as disarmament. SALT II did not abolish the total stock of warheads, nor did it stop all new weapons development. The United States could preserve the Trident system, while the Soviet Union could retain 308 of its very large SS-18 ICBMs. The parties continued to dispute how to count cruise missiles and the Soviet Backfire bomber. Judged as a device for reducing strategic vulnerability and stabilizing deterrence, the agreement had substantial significance. Judged by the disarmament goal of dismantling nuclear deterrence and the military industries supporting it, it was plainly inadequate.

The legal failure of SALT II was also more complicated than a simple collapse. After the Soviet invasion of Afghanistan, Jimmy Carter asked the Senate on January 3, 1980, to postpone consideration, and neither legislature ratified the treaty. Yet both governments stated that they would avoid actions defeating its object and purpose, and in 1982 Ronald Reagan likewise said that his administration would not undercut the SALT framework provided the Soviet Union showed comparable restraint. In 1984 and 1985 the United States accused the Soviet Union of violations, and in 1986 declared that it was no longer bound by the framework. Thus the familiar judgment that SALT II was “unratified but observed” describes a period of political restraint, not success as a fully binding treaty. Its limits and verification language nevertheless fed into the START I negotiations completed in 1991. The institution left both a failure and a successor.

Historians disagree partly because they count different things as success. Stability-centered accounts argue that the ABM limits and verification rules reduced incentives for miscalculation and preventive attack, while creating durable channels between hostile states. Competitive-policy accounts stress that each side used negotiations to preserve advantageous weapons while constraining the other's options. Disarmament critics point out that numerical ceilings and freezes still preserved a system of mass destruction. The evidence does not erase any of these readings. SALT did not end the nuclear competition, but it created a common grammar for managing it, and showed at the same time that this grammar was insufficient once political confidence disappeared.

The treaty failed, but the argument did not

What SALT left behind was not the conclusion that the nuclear arms race had been reduced. The SALT I Interim Agreement froze launcher numbers but did not reduce warhead totals, and SALT II set a ceiling of 2,250 delivery vehicles and sublimits involving MIRVed systems, rather than requiring the dismantlement of weapons already deployed. What these agreements established more securely than disarmament was mutual predictability. The two sides agreed not to interfere with the other's national technical means of verification, especially reconnaissance satellites, and not to use concealment measures that would defeat verification. They did not abolish nuclear forces, but they created shared rules about what was counted and how a possible violation could be judged.

SALT II's legal status reveals this achievement in an awkward way. It was signed in Vienna on June 18, 1979, but the U.S. Senate never ratified it, and Carter asked that consideration be suspended in January 1980. Even so, Carter and Brezhnev, and later Reagan, declared political commitments to exercise reciprocal restraint. The State Department's account at the time held that, although the treaty was unratified, the parties were obliged to refrain from acts defeating its object and purpose, and both sides broadly followed its framework until 1985. A treaty can therefore be a legal failure and still be a political agreement that constrained conduct.

Historians disagree about what, precisely, endured. One interpretation argues that SALT restrained the competition in ABM defences and institutionalized verification practices and negotiating language, thereby laying a ladder toward START. Another argues that its numerical ceilings did too little to stop MIRV deployment and qualitative modernization, preserving the underlying vulnerability of both forces, while an unratified SALT II could not withstand the first major political shock. The U.S. allegations of Soviet noncompliance after 1984 are evidence often used for this second view, but the document making that case was itself written from a political position. The central question is not simply whether every allegation was false. It is whether the institutions were strong enough to manage disputes over complicated counting rules and verification evidence inside the negotiating framework. The narrower conclusion commands the broadest agreement: SALT did not end the arms race, but it created rules for reading and delaying it, and those rules made later negotiations possible after détente collapsed. There is no comparable evidence that it made the nuclear competition stop.