Russian President Vladimir Putin could attempt to test NATO’s commitment to collective defence through a limited assault on one of the alliance’s member states, according to new U.S. intelligence assessments reported by The Wall Street Journal. The assessments reportedly examine a range of scenarios, from cyberattacks and sabotage to the deployment of unidentified armed groups and a small-scale land incursion on NATO’s eastern flank.
The identified risk period starts from the fall of 2026 and lasts until 2029. Nevertheless, this intelligence is not a forecast that Russia has made an intention to attack the NATO, nor is this evidence that any war between Moscow and the alliance will be imminent soon. This is rather a signal about the fact that the Kremlin may want to conduct some limited and well-calibrated military action which will check if the USA and its European partners will keep their collective-defense obligations. At the same time, the worst-case scenario is a limited invasion on the territory of NATO member-states and it is not viewed as likely to happen soon; yet, the risk may grow over time. English
The assessment marks a change from earlier expectations that Russia would avoid directly provoking NATO while its war in Ukraine continued. According to the reported analysis, Moscow may calculate that a limited operation could create political advantages without immediately triggering a large-scale conflict with the 32-member alliance.
A test of political will, not territorial conquest
The main goal of such an operation is not going to be a permanent acquisition of the territory itself. According to American officials quoted in media publications, the main goal may consist in the intention of dividing NATO and seeing how the alliance will react to the attack on one of its members. Cyber-attack aimed at disrupting government network, power supply system or financial organization can be seriously disruptive while creating uncertainty about the guilt.
The sabotage against railways, submarine cable, military and power infrastructure would create similar confusion. Such an attack conducted by unknown armed group would be even harder to deal with because Russia could claim that it had no role in it. Land incursion will be relatively risky from both military and political sides because it will be regarded as an armed attack. It can include the temporary occupation of the border region, the seizing of some strategic point or military action intended to gain some foothold before NATO acts unanimously.
The strategic calculation would rest on ambiguity. If Russia could keep an operation below the threshold of an unmistakable act of war, the Kremlin might seek to divide NATO governments over the appropriate response. Some members could favour immediate military action, while others might call for investigation, sanctions or diplomatic negotiations.
Article 5 and NATO’s response dilemma
The North Atlantic Treaty’s Article 5 declares that an armed attack against one or more NATO members in Europe or North America shall be considered an attack against all. It requires allies to assist the attacked member, but it does not prescribe an identical response from every country or automatically require an immediate declaration of war. Each member decides what action it considers necessary, including the possible use of armed force.
This ability to adapt is key to the strength of the alliance but could be the source of confusion in the face of a hybrid challenge. The presence of a clear-cut missile strike or invasion will be less complicated to manage than a cyber attack, sabotage or even invasion by forces that are not wearing the insignia of any particular nation. NATO has said before that a significant cyber attack or hybrid operation would necessitate an alliance response but will assess each situation depending on its gravity and context.
It is the very uncertainty about a hybrid attack that makes it appealing to a country looking to probe NATO without starting a full-scale war. An escalation dilemma will also arise from NATO’s inability to come up with the appropriate response. The failure to escalate may embolden Russian aggression and damage NATO’s credibility. Escalation through force may result in an uncertain confrontation between NATO and nuclear-armed Russia.
Why the eastern flank matters
The reported scenarios are likely to focus on NATO’s eastern flank, where the alliance shares borders or close geographical proximity with Russia and Belarus. The area includes the Baltic states, Poland, Finland, Romania and Bulgaria, as well as NATO’s northern and Black Sea security zones.
The Baltic states—Estonia, Latvia and Lithuania—are viewed as particularly exposed because of their geography, relatively small populations and proximity to Russia’s military presence in the Kaliningrad region and Belarus. Poland is also central to NATO’s eastern defence because it serves as a major logistical corridor for allied reinforcements.
The North Atlantic Treaty Organization claims that it has set up nine multinational battlegroups in the eastern flank region. They are incorporated into the NATO command system with the aim of offering a quick deterrent and ensuring that reinforcements arrive easily during times of crisis. Other initiatives by NATO in terms of deployment include increased air policing, maritime surveillance, air and missile defense, military exercises, pre-positioned equipment, and regional defense planning. It has also taken steps to defend the underwater infrastructure in the Baltic Sea region. It should be noted that the deployments by NATO are defensive in nature and aimed at preventing any conflict with Russia.
Hybrid warfare is already under way
The concern about a future limited attack is linked to what NATO and European governments describe as Russia’s ongoing hybrid campaign. The alliance has accused Moscow of cyberattacks, sabotage, information manipulation, political interference, airspace violations and threats to critical infrastructure.
In July 2026, NATO’s North Atlantic Council condemned what it called Russia’s “persistent malicious cyber activities” targeting allies and partner countries. The alliance said Russia was exploiting its cyber ecosystem to attack government institutions and critical infrastructure.
NATO officials have also warned about interference with undersea cables, GPS disruption, arson, sabotage and covert influence operations. Such activity is intended to weaken public confidence, create economic costs and pressure governments without crossing the traditional threshold of open warfare.
The Nordic and Baltic countries have described Russia’s hybrid activities as involving “information manipulation and interference, violations of airspace, sabotage, malicious cyber activities, disruption of critical infrastructure” and other coercive measures.
The issue is not whether Russia has already used hybrid tools against European countries. The question is whether Moscow might escalate those methods into a more deliberate operation against NATO territory.
Russia’s strategic narrative
The Kremlin has consistently portrayed NATO enlargement and Western military support for Ukraine as threats to Russian security. Moscow has described NATO’s expansion toward Russia’s borders as evidence of hostile intent and has warned that it would respond to the alliance’s military infrastructure.
In 2024, Kremlin spokesman Dmitry Peskov said Russia and NATO were in “direct confrontation.” Russian officials have also described possible NATO expansion involving Ukraine as an “unacceptable threat” to Russia’s security.
President Putin has repeatedly argued that Russia cannot feel secure while facing what he describes as a permanent threat from Ukrainian territory and Western-backed military structures. In a 2022 address, he said,
“Russia cannot feel safe, develop, and exist while facing a permanent threat from the territory of today’s Ukraine.”
These statements explain the political narrative Moscow uses to justify its military posture, but they do not prove that Russia has made a decision to attack a NATO member. The U.S. intelligence assessment concerns possible future calculations rather than a publicly announced Russian plan.
Russia’s military strength and constraints
The Russian war in Ukraine entails heavy military and economic costs. There are conflicting estimates of the number of casualties suffered by Russia during the war in Ukraine, and Moscow is not publishing accurate independent figures. According to the Center for Strategic and International Studies, Russian troops sustained some 1.4 million casualties in the period from February 2022 to June 2026. This means that the size of Russia’s manpower pool has decreased and huge amounts of tanks, artillery, rockets, and other military equipment have been used up. It will take time to build up Russia’s units and reserves for a large-scale war against NATO countries.
These limitations make a full-scale war on NATO unlikely until the war in Ukraine continues since Russia will be forced to fight a powerful coalition of countries with better combined economic capabilities, air forces, logistical support and industrial potential.
Nevertheless, the limitations do not eliminate the danger of a smaller operation. A cyberattack, sabotage mission, drone strike, maritime incident or brief border incursion would require far fewer resources than a large invasion. Russia retains significant capabilities in missiles, drones, electronic warfare, cyber operations, intelligence collection and nuclear deterrence.
Europe accelerates defence preparations
As a response to the Russian threat, NATO nations have raised their defense budgets and bolstered their military readiness. NATO’s own figures show that European allies and Canada raised defense spending by 20% in real terms in 2025. During the NATO summit at The Hague in 2025, NATO nations committed themselves to raise defense and security investments to 5% of GDP per year by 2035. This included 3.5% for core defense needs and 1.5% for resilience, infrastructure, cyber defense, and other security-related investments.
It is important to note that NATO deterrence does not only depend upon manpower, but also on ammunition inventories, air defense, mobility of its forces, intelligence, cyber defense and rapid reinforcement of vulnerable allies.
Germany and other European states have also warned that Russia could rebuild its military capacity after the Ukraine war. German officials have previously urged NATO members to be prepared for a possible Russian attack by 2029, while stressing that the purpose of such preparation is deterrence.
The competing European assessments
European intelligence services do not present a single timetable for a Russian attack. Estonia’s 2026 foreign-intelligence assessment reportedly concluded that Russia did not intend to attack Estonia or another NATO state in the immediate future, while still describing Moscow as a dangerous adversary.
In reviewing Baltic and Nordic evaluations of Russia’s threat, Estonia had identified the years 2028-2030 as a time when Russia might be able to mount a credible threat if they succeeded in regenerating their military capabilities following the Ukraine conflict. Other European security analysts have also suggested that Russia might be able to wage a regional conflict before they were able to fight a full-fledged war. As per a statement made by a senior military officer in Germany, Russia would be able to conduct “a minor, quick and regional limited” operation while simultaneously being engaged in a battle against Ukraine. This does not mean that both sets of reports are contradictory; they make a distinction between Russia’s capability, its potential and willingness to wage a military operation.
What the warning means
The new U.S. assessment should be read as a warning about NATO’s vulnerability to political testing rather than as confirmation of an imminent invasion. Russia may not need to defeat NATO militarily to gain a strategic advantage. It could seek to demonstrate that the alliance is slow, divided or unwilling to accept the risks associated with defending a small member.
For NATO, the solution comes through reduced ambiguity prior to any crisis. The attribution process, consultations, military preparedness and communications would all be essential for NATO to deal with any cyberattacks or acts of sabotage. Furthermore, it is necessary to ensure that Russia believes that any limited attack cannot stay limited in the event that NATO is under attack. For the wider Washington and European capitals, deterrence will be dependent on being ready.
Having the right military capabilities, greater eastern flank positioning and political unity might make it clear to the Kremlin that even a limited attack would provoke NATO’s response. However, if NATO lacks political unity in its ranks, then any limited act of aggression might become an experiment with consequences much wider than what was originally intended. The critical time frame pointed out by the U.S. intelligence—autumn 2026 until 2029—will consequently be assessed not just by Russian military preparations but also by NATO’s ability to convey to Moscow that Article 5 is politically and militarily credible.
