For more than three years, the central assumption underpinning European security has been that Vladimir Putin would avoid any action risking a direct military confrontation with NATO.
British intelligence officials are increasingly questioning whether that assumption still holds.
According to security sources cited by the Daily Mail, British officials believe the Kremlin may be preparing to test the alliance’s resolve within months, calculating that shifting geopolitical pressures have created an unusually favourable moment to probe Western unity without necessarily triggering outright war.
If the assessment proves accurate, it would represent less a plan for invasion than a strategy of controlled escalation—one designed to expose divisions inside NATO while keeping any confrontation below the threshold of full-scale conflict.
That distinction matters. Western intelligence believes Moscow sees several developments working in its favour simultaneously.
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The White House is increasingly consumed by the crisis involving Iran and security across the Middle East. Ukraine remains locked in a grinding war of attrition, while political changes in several European capitals have introduced new variables into allied decision-making.
One intelligence source suggested the Kremlin believes time is no longer on Russia’s side militarily.
An intelligence source told the Mail: “There’s now a strong belief Putin is preparing some sort of direct confrontation with NATO at some point over the next couple of months.”
“If he can’t somehow change the momentum on the battlefield, the war will be lost,” the source reportedly said.
That calculation could make limited confrontation appear less risky than strategic stagnation.
Rather than seeking decisive military victory, Russia may instead be looking to undermine confidence in NATO’s deterrence.
Few analysts believe Moscow would deliberately launch a conventional attack on a NATO member.
The costs would be catastrophic.
The intelligence source said: “There’s a feeling that if he can’t somehow change the momentum on the battlefield, the war will be lost.”
“He’ll want to try and test Burnham, and see if he can exploit any divisions between the old and new administrations,” the source added.
Far more plausible is a continuation—and possible intensification—of the so-called grey-zone tactics that have increasingly characterised Russia’s confrontation with the West.
These include cyber attacks, GPS interference, sabotage, maritime disruption, intelligence operations, airspace incursions and pressure exerted through Russia’s shadow fleet.
Each individual incident remains ambiguous enough to avoid immediate escalation.
Collectively, however, they force NATO governments into constant decisions over whether—and how strongly—to respond.
That strategic ambiguity has become one of Moscow’s most effective tools.
British officials reportedly believe the Kremlin could view the arrival of Prime Minister Andy Burnham as an opportunity to assess whether a new administration responds differently to pressure than its predecessor.
Whether that calculation is accurate is less important than the possibility that Moscow believes it is.
Recent events have only heightened concern.
Russia’s shadow fleet has altered its operating patterns following British enforcement action in the English Channel, while a Russian warship conducted live-fire drills in waters off the south-west coast of Britain on the day Burnham entered Downing Street.
Individually, neither event represents an act of war.
Together, they contribute to a broader pattern of strategic signalling.
The challenge facing Britain extends beyond Russia alone.
At the same time as tensions with Moscow persist, Iran has issued threats against British military facilities supporting American operations in the Middle East.
The result is an increasingly interconnected security landscape in which crises in Eastern Europe and the Gulf cannot easily be treated as separate theatres.
Military planners now face the prospect of managing multiple sources of strategic pressure simultaneously.
That partly explains why Defence Secretary Wes Streeting has intensified engagement with Washington and reportedly proposed a broader NATO security summit aimed at reinforcing allied coordination.
Whether the reported intelligence assessment ultimately proves correct remains impossible to verify publicly.
Intelligence reflects probabilities rather than certainties, and governments routinely prepare for scenarios that never materialise.
Even so, the reported warning highlights a broader reality confronting Europe.
The question is no longer simply whether Russia intends to continue its war in Ukraine.
It is whether the Kremlin increasingly believes the balance of geopolitical distraction, political transition and competing global crises provides an opportunity to test the credibility of NATO itself.
History suggests deterrence is strongest when adversaries believe there is no uncertainty about an alliance’s response.
The greatest risk for Europe may therefore lie not in a dramatic military confrontation, but in a succession of carefully calibrated provocations designed to discover precisely where that certainty begins to fade.
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