The two-day NATO Summit at Ankara, which concluded on 8 July 2026, was declared by President Donald Trump to be "a tremendously successful summit." That assessment was noteworthy because the meeting took place against the backdrop of disruptive political messaging. In the weeks leading to the summit, President Trump had publicly criticised several allies over defence spending, described Spain as a "terrible partner" and a "wasted cause," reiterated his interest in Greenland, and announced unilateral decisions relating to the Iran conflict. Any one of these issues could have overshadowed the summit.
Yet NATO Secretary General Mark Rutte struck an entirely different tone. His message was simple: NATO had delivered. Defence investment was rising, new capabilities were entering service, defence-industrial production was expanding, and European Allies and Canada were assuming greater responsibility for their own security. "We are rebalancing our security for the better, and that is what NATO 3.0 is all about," he declared.
The Ankara Summit Declaration echoed that confidence. Its opening paragraph reaffirmed the Alliance's enduring commitment: "We, the Heads of State and Government of the North Atlantic Alliance, have gathered in Ankara to reaffirm our ironclad commitment to our collective defence under Article 5 of the Washington Treaty and to the transatlantic bond."
Measured against its immediate objectives, the summit was indeed successful. Defence spending commitments increased, military modernisation accelerated, industrial capacity expanded and transatlantic unity was publicly reaffirmed.
Yet beneath the carefully choreographed optimism lay a more fundamental question. What exactly is NATO collectively defending in the twenty-first century?
That question, more than any procurement announcement or budget pledge, is likely to define the Alliance's future.
The Original Compact
When the Washington Treaty was signed in 1949, NATO had a singular purpose. The Soviet Union posed an identifiable military threat to Western Europe. The Alliance existed to deter territorial aggression.
Article 5 reflected that reality. It states that an armed attack against one or more members "in Europe or North America" shall be considered an attack against them all.
Article 6 further defines the geographical area covered by the treaty.
The language was neither vague nor accidental. The twelve founding members were concerned with one contingency: What should the Alliance do if the Soviet Union attacked Western Europe/ North America, employing conventional military means or by employing nuclear weapons?
For four decades, the answer was clear. Geography defined the battlefield, the adversary was known, and collective defence meant resisting conventional or nuclear aggression against Allied territory.
The breakup of the Soviet Union, and the emerging threats thereafter, has changed the assumptions on which the collective defence was formulated, vide the treaty. Is there thus a need to reconsider the assumptions?
The Turning Point
The terrorist attacks of 11 September 2001 fundamentally altered NATO's strategic environment.
For the first, and only time in its history, Article 5 was invoked. The United States had suffered an attack on its homeland, not from another state but from Al Qaeda, a transnational terrorist organisation operating from Afghanistan. The invocation itself generated little controversy. However, the response did.
European allies supported the United States, but participation varied according to domestic political processes, national priorities and public opinion. Britain joined military operations almost immediately. Germany's participation required parliamentary approval. Spain never secured legislative authorisation to deploy combat forces. The Alliance agreed that America had been attacked. It did not agree equally on the scope or duration of the response.
That divergence widened further when the "Global War on Terror" expanded to Iraq. Iraq was not an Article 5 operation, yet it became politically associated with Afghanistan. Deep divisions emerged within NATO, demonstrating that agreement on collective defence does not necessarily translate into agreement on collective action.
Afghanistan and Iraq revealed an ambiguity that had always existed within Article 5 but had never been tested - agreement on the existence of an attack does not guarantee agreement on the political objective of military action.
A Changed Security Environment
The strategic landscape confronting NATO today bears little resemblance to that of 1949.
The Alliance has expanded from twelve to thirty-two members. New members have brought new histories, new threat perceptions and new strategic priorities.
Equally significant, the character of conflict has changed. Threats now include terrorism, cyber warfare, attacks on satellites, sabotage of critical infrastructure, disinformation campaigns, economic coercion, autonomous weapons and grey-zone operations deliberately designed to remain below the threshold of conventional war.
These developments raise uncomfortable questions.
Does a crippling cyberattack on a national power grid constitute an armed attack?
What about the destruction of undersea communication cables?
Or attacks on military satellites?
Or coordinated disinformation designed to paralyse democratic institutions?
The treaty drafted in 1949 offers no definitive answers.
The Geography of Collective Defence
The issue is no longer simply who the adversary is. It is where collective defence begins and ends.
The Alliance has gradually extended its activities well beyond the Euro-Atlantic region. Afghanistan represented the first sustained military operation outside the treaty area. Counter-piracy operations off the Horn of Africa followed. NATO has strengthened partnerships across the Indo-Pacific.
Yet the Ankara Summit was notable as much for what it omitted as for what it declared.
The Indo-Pacific Four—Australia, Japan, New Zealand and South Korea—were absent from the summit agenda. References to China were noticeably restrained. There was no attempt to transform NATO into a global military alliance.
That restraint reflected political reality.
Many European members remain unconvinced that China poses an immediate military threat to European security. They view economic competition and strategic rivalry differently from armed aggression. While Washington had increasingly framed China as the principal long-term strategic competitor, European capitals remain more focused on Russia. The reference by President Trump to the G2 (USA and China) meeting while at the G7 summit this year, and his subsequent meeting with President Xi in Beijing, has certaily added to the political uncertainty and purpose of NATO.
The Alliance therefore confronts differing definitions of security.
Divergent Threat Perceptions
The Ankara Summit also exposed differences among Allies that cannot be resolved merely by increasing defence budgets.
For Poland, Finland and the Baltic states, Russia remains the overriding security concern.
Southern European countries often prioritise instability across the Mediterranean, migration and terrorism.
Turkey occupies a unique strategic position, balancing its NATO commitments with complex relationships involving Russia, the Middle East and the Black Sea. Can S-400 and F-35 co-exist within a NATO member state?
Spain's public disagreement over defence spending illustrated more than a budgetary dispute. It reflected a different understanding of strategic priorities. President Trump's unusually direct criticism transformed what might once have remained an internal policy disagreement into a public political confrontation.
Iran presents another example. Most NATO members acknowledge the risks posed by Iran's nuclear programme, missile capabilities and regional proxy network. Yet there is no consensus that military confrontation represents the preferred response.
It is evident that agreement on the threat does not imply agreement on the remedy.
The same pattern increasingly characterises debates over China, the Middle East and even the future relationship with Turkey.
Ukraine and the Limits of Consensus
Ukraine illustrated both NATO's unity and its limits.
The Alliance reaffirmed long-term support through military assistance, financial commitments and industrial cooperation. Kiev was offered expanded defence production and sustained political backing.
What Ukraine did not receive was membership or the collective security guarantee of Article 5.
That decision reflected political caution rather than military weakness.
Many Allies continue to support Ukraine's defence while remaining reluctant to assume the legal obligations that membership would entail.
Once again, NATO demonstrated considerable military solidarity while stopping short of complete political consensus.
The Real Strategic Question
Clausewitz famously observed that war is the continuation of politics by other means.
The reverse is equally true.
Military alliances derive their effectiveness not merely from military capability but from political clarity.
The Ankara Summit demonstrated beyond doubt that NATO's military instrument, the sword is becoming sharper; defence spending is increasing; industrial production is expanding; European members are assuming greater responsibility; the Alliance's deterrent capability is improving.
Its political direction, however, remains less certain.
Should NATO remain a regional collective defence organisation, or should it assume a broader global security role?
Does Article 5 apply only to territorial attacks, or should it evolve to encompass cyber warfare, space systems and hybrid threats?
Can attacks on critical infrastructure or economic coercion trigger collective defence?
Should NATO respond only to attacks on Allied territory, or also to attacks on Allied interests?
These questions are no longer theoretical.
They lie at the heart of contemporary deterrence.
Sharper Sword, To What Purpose
The Ankara Summit succeeded on its own terms. It strengthened NATO's military capabilities, reinforced deterrence and reaffirmed transatlantic solidarity.
Yet it left unresolved the more fundamental questions that will determine the Alliance's future.
The challenge confronting NATO is no longer merely building stronger armed forces. It is achieving a common political understanding of when, where and why those forces should be employed.
In 1949, geography defined the threat and military force defined the attack.
In 2026, neither assumption remains sufficient.
Threats are global, hybrid and frequently anonymous. Political priorities differ among thirty-two democracies. Consensus can no longer be assumed simply because the treaty exists.
The Ankara Summit therefore marked not the end of a debate but the beginning of a more profound one.
NATO emerged from Ankara with a sharper sword.
Whether it also possesses a consensual purpose, which can serve as a reliable compass, remains the defining strategic question of our time.
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