Confident Enough to Disagree: What NATO 3.0 Can Learn from How the Cold War Ended

Near the end of his Ditchley Foundation Annual Lecture on September 16, 2026, NATO Secretary General Mark Rutte said something that deserves more attention than his spending figures or his account of NATO’s three eras. NATO 3.0, he said, is “the most significant transformation of our Alliance in a generation,” and it will require “open and honest conversations about the tough decisions this modernisation will require.” Then he added: “We are confident enough in NATO to have our differences, and we are strong enough to overcome them. Because we agree on the fundamentals.”

That sentence is close to the argument of my forthcoming book, Present at the Ending: Working to Close the Cold War, the volume that closes the four-volume series that began with The Western Alliance in Transition. The book is partly memoir, a record of the 1980s as I moved through London, Paris, Bonn and Washington, and partly an attempt to answer a question that has stayed with me for four decades: how did an alliance so divided over nuclear deployment, détente and burden-sharing manage the end of the Cold War without the war so many people feared?

The answer, in a phrase General Pasquale Preziosa, former Chief of Staff of the Italian Air Force, offered me while reading an early draft, is that the West did not win the Cold War by agreeing. It won by getting disciplined about disagreeing.

Rutte’s sentence frames that discipline as a matter of confidence. The history suggests it is something more demanding: a capacity that has to be built, maintained and protected, mostly by people well below the level of the leaders who give speeches at Ditchley.

The Myth of Western Unity

The temptation, looking back at the 1980s, is to remember the decade as a story of unity: Reagan, Thatcher, Kohl and Mitterrand standing shoulder to shoulder against Moscow. That is not what happened.

Thatcher objected publicly when the United States invaded Grenada in October 1983 with almost no warning to London. She accepted the Strategic Defense Initiative only with conditions, and Reykjavik in 1986 alarmed her because Reagan and Gorbachev had explored sweeping nuclear reductions without consulting the allies whose security depended on the balance. Mitterrand arrived in the Élysée in 1981 with Communist ministers in his cabinet, at a moment when Reagan’s early foreign-policy team viewed his government with open suspicion. Kohl held the alliance line on Euromissile deployment against the largest protest movement in West German history, while keeping as his foreign minister Hans-Dietrich Genscher, whose name had become shorthand for a détente-minded balancing of East and West.

These were serious disagreements, not stage-managed disputes. And yet the alliance held, and more than held: it managed the most consequential strategic transformation of the century.

What made the difference was not that the leaders liked one another. Often they did not. It was that beneath them sat a dense network of working relationships that could keep functioning regardless of the political temperature at the top.

Two Spy Stories and One Lesson

Two intelligence episodes from the decade show how this worked.

At the G7 summit in Ottawa in July 1981, Mitterrand, the Socialist president Washington distrusted, met Reagan privately and handed him the Farewell dossier, the product of a French-run source inside the KGB’s technology-collection apparatus. It documented the scale of Soviet theft of Western technology and became one of the most consequential intelligence gifts of the Cold War. Mitterrand had no natural rapport with Reagan and no obligation to help an American administration whose politics he did not share. He decided that France’s interest in keeping the channel to Washington open outweighed the political estrangement.

The British case was the mirror image. Through Oleg Gordievsky, its source inside the KGB, London learned in 1983 of genuine alarm in Soviet intelligence circles that NATO might be preparing a nuclear first strike. Thatcher’s government did not fully trust the American intelligence community, and Aldrich Ames would later show that the caution had merit. It shared the material anyway, through a narrow and carefully bounded channel.

Neither outcome was inevitable. Both depended on officials on both sides of the Channel and the Atlantic who treated the relationship itself, not just the intelligence moving through it, as the asset to be protected. Disagreement at the political level did not poison the working level. That separation of layers is the discipline of disagreement, and it is not a natural state of affairs. It has to be built.

The Night Judgment Mattered

The second discipline the book describes is judgment: the capacity to read ambiguous evidence correctly under pressure, when a wrong reading could start a war neither side wants.

In November 1983, NATO ran Able Archer 83, a command-post exercise simulating the Alliance’s nuclear release procedures. To NATO it was routine. To a Soviet leadership primed by years of Andropov’s Operation RYaN, an intelligence effort built to find evidence of a Western surprise attack, it looked like a rehearsal for the real thing. Soviet forces in Eastern Europe went to heightened readiness.

On the night of November 7–8, Brigadier General Leonard Perroots, then chief of intelligence for United States Air Forces in Europe, had to decide what that pattern meant. He judged, on the accumulated pattern of intelligence rather than the most alarming single data point, that he was watching fear rather than aggression, and he recommended against answering alert with alert. Gordievsky’s reporting later confirmed how real the Soviet fear had been.

He told General Billy Minter, the USAFE commander, that “we would carefully watch the situation but there was insufficient evidence to justify increasing our real alert posture”.

Rutte’s Ditchley speech offered its own reading of the adversary: Russia’s campaign of hostile actions is “a sign of weakness, and a symptom of Putin’s failure in Ukraine.” That may well be right. But Able Archer is a reminder that weakness and fear are not the same as safety. An adversary that believes itself cornered can be more dangerous, not less, and the professional discipline to tell the difference is not something an alliance can improvise on the night it is needed.

What Ditchley Was Built For

The third discipline is the one Rutte’s speech illustrates without naming. Preziosa called it connection: the human and institutional density, accumulated before any crisis, that lets disagreement and judgment actually work.

Rutte opened his lecture by noting that the Ditchley Foundation “was established to support transatlantic relations, to bring together decision makers and experts, to exchange ideas.” He recalled that Churchill used Ditchley Park as a weekend retreat where he met Roosevelt’s envoys to make the case for American support and to negotiate Lend-Lease.

That is where the network I watched operating in the 1980s began. When Thatcher’s government needed a channel to Washington for the Gordievsky material, it did not build one in the middle of the crisis. It had one, imperfect and jealously compartmented, because the Anglo-American relationship had been under continuous construction since the war years. When Perroots needed to tell an anxious alliance something it did not want to hear, he drew on decades of professional training that rewarded evidence over comfort.

My own experience of that network was ordinary rather than dramatic. Joe Fitchett of the International Herald Tribune taught me, over years of conversation with no deadline attached, how to read a European argument for what it actually was rather than what an American briefing paper assumed it must be. Officials and analysts opened doors to me for reasons that had more to do with whether they judged me worth the trouble than with any credential I carried. None of it was built for a crisis. It was simply relationship, accumulated in advance of need, by people who had no way of knowing which relationship would turn out to matter.

The Paradox of Bandwidth

Preziosa put the present problem to me as a paradox. We have vastly more communications technology than the officials of the 1980s could have imagined: more intelligence, more data, instant contact between capitals, and now artificial intelligence on top of all of it. And yet we may have less of the human and institutional connectivity that let the West manage a transformation of the international system without great-power war. We communicate constantly, he wrote, but perhaps we know one another less.

He identified several reasons. Diplomacy is increasingly episodic and organized around individual leaders rather than sustained by the officials beneath them, so relationships can disappear when a leader leaves office. Political polarization makes every government’s commitments look less durable to its partners. Social media makes it harder to explore a compromise quietly before it hardens into a public position neither side can retreat from.

Read against that diagnosis, the Ditchley speech is revealing. NATO 3.0, Rutte said, is “a modernised Alliance, agreed by all NATO leaders at our Summit in Ankara.” In Ankara, “all Allies reaffirmed their ironclad commitment.” He met the British prime minister that afternoon. The actors in his account are leaders and summits, which is natural in a speech by the Alliance’s senior official. But the history of how the Cold War ended suggests that leader-level agreement is the least durable part of alliance cohesion. Warmth between leaders was not the precondition for the discipline the 1980s alliance practiced. Its absence was survivable precisely because the discipline did not depend on it.

What has eroded since then is not the chemistry at the top, which has been unreliable in every decade. It is the density of the layer beneath it.

A Connection Target for NATO 3.0

NATO 3.0 has a spending target: 5% of GDP for defense and security by 2035. It has capability priorities: deep precision strike, integrated air and missile defense, drones and intelligence. It has a political formula: a stronger Europe in a stronger NATO.

What it does not yet have is a connection target.

If the history of the Cold War’s ending is any guide, the rebalancing Rutte describes will produce disagreement: over burden-shifting, over the pace of European leadership, over Russia policy, over the role of the United States. That is not a sign of failure. It is the normal condition of an alliance of democracies. The question is whether the Alliance is building the infrastructure to absorb that disagreement without breaking.

That infrastructure is unglamorous. It is officer exchange programs and joint professional education. It is liaison relationships between intelligence services, sustained across changes of government. It is forums like Ditchley, where decision makers and experts meet often enough to know what each other will actually do under pressure. It is the habit of maintaining a working relationship with a foreign counterpart for no immediate reason beyond the belief that it might matter someday.

Preziosa pointed out that one institution still produces this kind of network almost by accident of its own culture: the military. Officer exchanges, joint exercises and professional education still generate the transnational relationships that the rest of the alliance has largely stopped producing. Rutte’s observation that NATO 3.0 means “European generals in more posts in NATO’s command structure” matters here, not only as burden-shifting but as a way of creating the working relationships the Alliance will need when the next crisis arrives.

Reconstruction, Not Nostalgia

None of this is an argument for nostalgia. The 1980s did not produce a uniquely gifted generation of officials. Perroots and Gordievsky’s British handlers were doing their jobs. Thatcher’s and Mitterrand’s governments built their channels to Washington despite deep political estrangement, not because the right statesmen happened to be in office at the same time. The capacity that made the difference was infrastructure, built deliberately and protected over years by people who understood they were building something rather than performing solidarity.

Rutte closed his lecture by quoting Churchill’s description of NATO as “the striking product and expression of a world wearied by war, determined to build its own organisation, in such strength and power, that there will be peace.” The emphasis on building is right. But strength and power are not only budgets and production lines. They are also the patient, invisible work of people who know one another well enough to disagree without breaking.

The Cold War in Europe did not end because the West stopped disagreeing with itself. It ended because enough people, on both sides of every fault line that divided the Alliance, had spent years building the connections that let disagreement become discipline rather than paralysis.

Rutte is right that NATO is confident enough to have its differences. The test of NATO 3.0 is whether it is still building the connections that made that confidence justified the last time it was tested.

Source: Mark Rutte, “NATO 3.0: Why rebalancing the transatlantic relationship matters,” The Ditchley Foundation’s 62nd Annual Lecture, Oxfordshire, United Kingdom, 16 September 2026, NATO transcript (as prepared).

Present at the Ending: Working to Close the Cold War is the fourth and closing volume of a four-volume series on the Western Alliance.