The Article 5 Trap: Russia’s Next War May Be Against NATO’s Nerves
By Matthew Parish
Monday 14 September 2026
There is an uncomfortable paradox at the heart of the war in Ukraine. The less successful Russia becomes in achieving her original strategic objectives there, the greater may become the temptation in Moscow to widen the confrontation. This sounds counter-intuitive because states that are struggling in wars are normally expected to seek exits from them. Yet the Kremlin does not necessarily understand the conflict in Ukraine as a conventional contest over territory. Increasingly it presents the war as part of a larger confrontation between Russia and the Western political and security system. If Russia cannot demonstrate her supremacy by defeating Ukraine, it has another possible means of claiming strategic victory: demonstrating that the institutions upon which Western security depends do not actually work.
The institution most vulnerable to such a demonstration is NATO, and the point at which NATO is simultaneously strongest and most fragile is Article 5 of the North Atlantic Treaty. Article 5 is commonly paraphrased as saying that an attack upon one NATO member is an attack upon them all. The reality is more subtle. Each ally undertakes to assist an attacked member by taking such action as it considers necessary. NATO has also made clear that sufficiently serious cyber or hybrid attacks may in principle reach the threshold for collective defence, but such questions necessarily depend upon circumstances. That ambiguity was historically useful because it prevented an adversary from knowing precisely where NATO’s red lines lay. Today it also creates an opportunity for Moscow.
Russia does not need to invade Poland
The popular imagination conceives of a Russian attack upon NATO in terms inherited from the Cold War: tanks crossing borders, aircraft bombing military bases and divisions pouring through the Suwałki Gap. This is probably the least attractive way for Moscow to test Article 5 because it would present NATO with the easiest possible political decision. A manifest invasion of Poland, Finland or one of the Baltic states would leave relatively little room for arguments about attribution, proportionality or whether the North Atlantic Treaty applied. Russia would have transformed a potentially divided alliance into one confronting an unmistakable common enemy.
Russia would also face overwhelming conventional resources if NATO mobilised effectively. Moscow therefore has little incentive deliberately to manufacture circumstances in which thirty-two governments suddenly discover unanimity. The more intelligent Russian strategy would be precisely the opposite: to create an incident serious enough that failure to respond damages NATO but ambiguous enough that some NATO governments hesitate to respond. This is the Article 5 trap, and it is far more dangerous than the crude scenario of Russian armoured columns deliberately driving towards Warsaw.
Such a confrontation might begin with drones entering NATO airspace. It might involve sabotage against railways carrying military equipment to Ukraine, an attack upon an undersea cable, a cyberattack disabling part of a country’s electricity infrastructure, an explosion at a defence factory or an operation conducted through proxies whose relationship with Russian intelligence services Moscow vehemently denies. Indeed much of this grey-zone landscape already exists. European governments have become increasingly concerned about sabotage, cyber operations, GPS interference, attacks upon infrastructure and other hostile activities that may be connected with Russia but that fall deliberately into the uncertain territory between espionage, subversion and conventional warfare.
The essential Russian strategic question is therefore not whether Russia can defeat NATO. It plainly cannot expect to defeat the combined conventional power of the Alliance in a straightforward military contest. The more interesting question is whether Russia can persuade NATO not to fight at all, or at least not to fight quickly enough to preserve the credibility of its collective defence guarantee. Those are profoundly different propositions, and the second presents Moscow with possibilities that the first does not.
The experiment
Imagine that a Russian drone crosses into Estonia and destroys a military installation, killing six soldiers. Moscow announces that the incident was accidental. Perhaps it claims Ukrainian electronic warfare diverted the drone. Perhaps Russia insists that the aircraft was Ukrainian. Perhaps apparently independent commentators immediately circulate photographs purporting to demonstrate that the wreckage is of Western manufacture. Estonia requests consultations and NATO governments begin debating what has happened.
Washington asks for evidence while Germany urges restraint. Hungary objects to escalation and several governments suggest an independent investigation. Moscow announces that any attack upon Russian territory will produce catastrophic consequences. Russian nuclear forces conspicuously conduct an exercise, financial markets fall and television stations fill their schedules with retired generals discussing the possibility of nuclear war. For forty-eight hours nothing happens. Those forty-eight hours might constitute one of the greatest Russian strategic victories since the end of the Second World War because the purpose of the operation would never have been the destruction of the Estonian installation. It would have been the creation of doubt.
Article 5 is ultimately a promise and, like every promise, its power depends upon the expectation that it will be honoured. Once governments begin calculating whether Article 5 really applies to six dead Estonian soldiers, Moscow can ask what happens with twelve. It can then ask what happens with twenty, a temporary occupation of an isolated border post or something larger. This is how deterrence can collapse: not necessarily with a dramatic decision to abandon an ally but through incremental uncertainty in which every individual act seems insufficiently important to justify the risks of decisive retaliation.
Ukraine is therefore part of NATO’s defence
This explains something that Western politicians have often been reluctant to articulate. Supporting Ukraine is not charity, nor is it principally an expression of sympathy with a country subjected to invasion, however morally compelling that sympathy may be. Ukraine is absorbing Russian military capacity that might otherwise eventually be directed against Europe, while demonstrating that changing European borders through military force is extraordinarily expensive.
More importantly, Ukraine is teaching Russia lessons about Western political will. If Moscow emerges from the Ukrainian war believing that Western democracies possess formidable weapons but fragile political nerves, then the Kremlin may conclude that the next campaign should concentrate less upon destroying armies and more upon breaking alliances. The battlefield then moves from Donetsk to the conference rooms of Brussels, Berlin, Paris, London and Washington. Russia’s objective would cease to be the occupation of large amounts of territory and become instead the demonstration that Western governments cannot agree upon what they are prepared to defend.
This is why the outcome in Ukraine matters far beyond Ukraine’s borders. A Russian state that concludes that sustained violence eventually causes Western governments to retreat will apply that lesson elsewhere. A Russian state that concludes that aggression produces increasingly severe military, economic and political consequences will behave differently. Deterrence is not an abstract quantity contained inside missiles or tanks; it is a conclusion drawn inside the minds of adversaries about the likely consequences of their actions.
The American question
This brings us to the most dangerous variable: the United States. American ambivalence does not mean that the United States has formally abandoned NATO, and the Alliance continues to maintain enormous military capabilities. European governments are also increasing defence expenditure substantially. Nevertheless the political atmosphere has changed. Washington has pressed Europeans to assume far greater responsibility for their own defence, while American policy towards Ukraine and Russia has become less predictable than during the earlier stages of the war.
From Moscow’s perspective, the important issue is not whether the United States would ultimately defend Poland or Estonia. Nobody can know with certainty how an American administration would react until the circumstances arose. The important issue is whether Vladimir Putin believes there is sufficient uncertainty to make an experiment worthwhile. If Moscow believes that Washington might spend the first seventy-two hours of a crisis asking whether the Europeans had done enough for themselves, whether the incident was really deliberate or whether some compromise could prevent escalation, then deterrence has already weakened irrespective of what the United States might ultimately decide to do.
This is the peculiar character of deterrence. Military capabilities matter enormously, but perceptions about willingness matter almost as much. NATO can possess thousands of aircraft, enormous armies and nuclear weapons, yet if Moscow doubts the political mechanism through which those resources would be employed then their deterrent value is diminished. American ambiguity can therefore become dangerous even if no American President actually intends to abandon NATO, because Moscow may decide to investigate the ambiguity experimentally.
Europe must become capable of saying yes without Washington
The solution is not endless European complaints about American unreliability. Europe has had sufficient warning that American strategic priorities are changing and that no permanent security system should depend upon the domestic politics of a single country, however powerful. European NATO members must therefore construct a conventional military capability able to defeat a limited Russian attack without waiting for large-scale American reinforcement.
This does not require replicating the entire United States military. It requires something more practical: substantial ammunition reserves, integrated air and missile defence, enormous quantities of inexpensive interceptor drones, long-range precision strike capabilities, hardened airfields and command centres, rapidly deployable land forces, functioning military rail logistics, resilient telecommunications, protected ports and a dramatically enlarged defence-industrial base. Europe also requires military headquarters capable of commanding large-scale operations at short notice rather than merely coordinating multinational exercises conducted according to predetermined timetables.
Above all, Europe needs forces already positioned where they might be required. A brigade sitting in Germany that requires political approval, railway capacity and several days to reach Estonia has a different deterrent value from a brigade already in Estonia. The purpose of forward deployment is not merely tactical. It removes political choices from the opening hours of a war. Russia must understand that attacking Baltic territory automatically means fighting British, French, German, Polish and other European soldiers from the first minute. This transforms Article 5 from a diplomatic question into a military fact.
Poland becomes indispensable
This transformation inevitably increases the strategic importance of Poland. For historical, geographical and increasingly military reasons, Poland is becoming the central conventional military power of NATO’s eastern flank. Britain and France contribute capabilities of a different kind, including nuclear forces, sophisticated air power, intelligence and expeditionary experience. Germany provides enormous industrial and logistical potential while Finland and the other Nordic countries provide formidable geographical, military and technological advantages.
Poland, however, occupies the crucial ground between Western Europe’s military resources and the eastern frontier. A credible European deterrent therefore increasingly requires an axis running from Britain and France through Germany and Poland into Finland and the Baltic states. It also requires political arrangements allowing these countries to act quickly in a crisis rather than discovering after an attack that every national parliament, ministry and military command possesses a different understanding of what should happen next.
Ukraine belongs strategically to the same architecture whether or not it formally joins NATO in the immediate future. The Ukrainian Armed Forces now possess something virtually no Western European military possesses: extensive contemporary experience fighting the Russian military under conditions of electronic warfare, drone saturation, mass artillery, missile attack and rapidly changing battlefield technology. Any future European security system that fails to incorporate Ukrainian military knowledge would therefore discard the continent’s greatest reservoir of practical experience about the adversary it is principally designed to deter.
The response must be greater than the test
There is also a more difficult lesson. If Russia deliberately engineers a small Article 5 incident, NATO cannot afford merely to replicate the scale of the Russian action. If Moscow destroys one NATO radar installation and NATO responds by destroying one Russian radar installation, the Kremlin may conclude that it has discovered a manageable system of military exchange in which limited attacks upon the Alliance produce limited and predictable costs.
That is precisely the lesson NATO must prevent. The response to a deliberate Russian military test would need to be sufficiently powerful in conventional terms to demonstrate that Moscow cannot determine the subsequent scale of the confrontation while remaining carefully controlled so as to reduce the danger of nuclear escalation. The objective should not be revenge and it certainly should not be automatic escalation towards general war. The objective should be the restoration of deterrence by demonstrating that deliberate attacks upon NATO create consequences substantially greater than the tactical advantages they obtain.
The precise response would necessarily depend upon circumstances and it would be foolish to announce predetermined target lists in advance. The principle is more important. Russia must understand that a supposedly clever, limited attack cannot be converted into a cheap geopolitical experiment. A small deliberate attack upon NATO must create a sufficiently serious Russian military problem that repeating the experiment becomes unattractive.
Nuclear weapons complicate everything
Russia would inevitably accompany such an experiment with nuclear threats. This behaviour is already familiar because nuclear rhetoric is useful precisely insofar as Western societies are frightened by it. Russian leaders understand that democratic governments have an entirely proper horror of nuclear war and that the mere invocation of nuclear escalation can transform a discussion about conventional military policy into a debate about civilisation’s survival.
Yet nuclear deterrence works in both directions. Britain, France and the United States possess nuclear weapons, and Russia cannot rationally assume that it may use nuclear weapons against NATO without risking consequences on a scale exceeding any conceivable political objective. The danger therefore lies less in the proposition that Moscow actively desires a strategic nuclear exchange than in the possibility of Western political paralysis caused by fear of one.
A NATO government that refuses every conventional response because Russia possesses nuclear weapons has effectively conceded that nuclear-armed states may attack their neighbours with impunity provided that they periodically threaten Armageddon. That would destroy the international security order far beyond Europe. China would notice, as would Iran, North Korea and every state contemplating whether nuclear weapons provide not merely protection against invasion but freedom to intimidate neighbours. The consequences for global nuclear proliferation would be profound.
The forgotten requirement: society
There is another European weakness that cannot be remedied simply by purchasing missiles. Europe must prepare its populations for a form of confrontation that may deliberately blur the boundaries between peace and war. Deterrence depends upon societies as well as armies because a government cannot maintain a determined military policy indefinitely if its population becomes convinced that every inconvenience, cyberattack or act of sabotage proves that confrontation with Russia is intolerably dangerous.
European governments therefore need credible civil-defence plans, strategic fuel reserves, redundant telecommunications, protected electricity networks, emergency medical capacity and clear procedures for responding to sabotage and cyberattack. Citizens need to understand that Russia’s confrontation with Europe may not begin with tanks. It may begin with trains mysteriously catching fire, payment systems failing, GPS interference around airports, an electricity substation exploding or a drone whose ownership nobody can immediately establish. None of these incidents individually resembles the beginning of a world war, and that is precisely their strategic attraction.
The purpose of such operations is psychological as much as physical. They seek to persuade European populations that supporting Ukraine and resisting Russia bring danger into their own homes, while accommodation with Moscow promises tranquillity. That strategy succeeds only if Europeans accept its premise. A resilient society treats sabotage as a reason to strengthen security rather than as an argument for conceding political demands to the suspected saboteur.
NATO without America — and therefore NATO with America
There is an apparent paradox in the solution to American ambivalence. The best way of keeping the United States committed to NATO may be for Europe to demonstrate that NATO does not depend absolutely upon the United States. A Europe capable of providing most of its own conventional defence becomes a far more attractive American ally because Washington is no longer being asked indefinitely to guarantee the security of wealthy European societies unable or unwilling to defend themselves.
American capabilities would remain extraordinarily important. Intelligence, satellites, logistics, strategic air power, missile defence, nuclear deterrence and reinforcement capacity cannot rapidly be replaced, and there is little reason why Europeans should want to replace them entirely. The objective should instead be to change the relationship from dependence into genuine alliance. In such an arrangement the United States provides capabilities that enormously strengthen European defence, but their temporary absence or delayed deployment does not leave Europe incapable of responding to aggression.
This distinction matters because Europe has spent too long confusing dependence with alliance. The Atlantic relationship will be stronger when Washington knows that its European allies can hold the line themselves and Moscow knows the same thing. American involvement then becomes an additional layer of overwhelming deterrence rather than the single political switch upon which the entire defence of Europe depends.
The Kremlin’s wager
Russia’s greatest strategic opportunity may therefore arise not from victory in Ukraine but from the possibility that the Ukrainian war reveals political weaknesses elsewhere. Moscow does not need to conquer Europe and it does not even need to conquer the Baltic states. It merely needs to demonstrate that NATO’s guarantee is conditional, negotiable or dependent upon the particular political mood in Washington at the moment an attack occurs.
Once that proposition has been established, every country on Russia’s frontier must reconsider its foreign policy. Investors reconsider risk, governments become more cautious about contradicting Moscow and smaller states begin accommodating Russian interests because they cannot be certain that Western security guarantees will operate when required. NATO might remain formally intact while its strategic substance gradually drains away. That would represent an extraordinary geopolitical victory obtained at comparatively little military cost.
This is why the next Russian escalation, if it comes, may look strangely unimpressive. It might consist of a drone, an explosion, a cyberattack, a handful of soldiers crossing a frontier and withdrawing, an unidentified vessel damaging a cable or a missile landing somewhere it supposedly was never intended to land. The immediate temptation will be to say that such things are too small to risk a major war. Yet that is precisely the reaction a strategy of incremental testing would seek to produce, because each successful test establishes the conditions for a slightly larger one.
The proper objective of NATO policy is therefore not to devise an automatic route towards a third world war. It is precisely the opposite: to ensure that Russia never believes a small attack offers a cheap way of discovering whether NATO is real. The Alliance’s military preparations, political arrangements and social resilience must make the answer obvious before the question is asked. Credible deterrence prevents wars because it eliminates experiments.
Russia has discovered in Ukraine that conquering a determined European nation is extraordinarily difficult. The most dangerous possibility is that Moscow draws from its failures there a different lesson: that defeating European armies is unnecessary if European governments can instead be frightened, divided and induced to defeat themselves. NATO’s task is to ensure that Russia never has reason to believe that proposition is true.
