Finland Rehearses Russian Missile Attack in Europe’s Biggest Civil-Defence Drill Since WWII

3 Sept

Finland Turns Giant Underground Shelter Into Wartime Refuge as Russia Fears Reshape Europe

Deep inside rock beneath the Finnish city of Kuopio, thousands of civilians, students, volunteers and officials are rehearsing a scenario Europe once hoped belonged to history. Electricity and water are disrupted, cyberattacks have hit critical infrastructure and missiles could be coming from neighbouring Russia.

More than 2,000 people are participating in Shelter 2026, a two-day exercise on September 2 and 3 described as Europe’s largest civil-defence drill since the Second World War. At its centre is Luola — “the Cave” — an underground sports and events complex that can be converted into a vast civil-defence shelter for thousands of people.

A Russian Attack Without the Missiles

The exercise does not mean Finland believes a Russian invasion is imminent. Finnish President Alexander Stubb said only days before the drill that he considered a Russian attack on a NATO member unlikely, arguing that Moscow would have little reason to deliberately trigger a confrontation with the entire alliance.

That distinction matters. Finland is not predicting war; it is practising what happens if deterrence fails.

The scenario being rehearsed in Kuopio involves the disruption of power and water through cyberattacks alongside the threat of missile strikes from Russia. Finnish conscripts have trained inside the shelter wearing protective equipment and measuring radiation, while hundreds of participants have experienced what it would mean to spend extended periods underground.

The official purpose of Shelter 2026 is broader than a conventional military attack. Kuopio says the exercise is designed to test the protection of large numbers of people under emergency conditions while strengthening command chains, communications, shared situational awareness and cooperation between authorities, companies, educational institutions and voluntary organisations.

That is what makes the drill significant. Modern war does not necessarily begin with tanks crossing a border. Electricity networks, telecommunications, GPS, water supplies, transport systems and public confidence can all become part of the battlefield before civilians ever hear an explosion.

Finland Never Really Stopped Preparing

Finland approaches that threat from a position different from much of Western Europe.

When the Cold War ended, many European governments reduced military readiness and treated large-scale territorial conflict as increasingly remote. Finland maintained conscription, a substantial reserve structure and a culture in which national resilience extended far beyond the armed forces.

NATO itself highlighted that difference when Finland joined the alliance. The organisation noted that the country had maintained comparatively high defence readiness after the Cold War, retained a large reservist army and developed unusually strong preparedness across society.

That model is now attracting far more attention.

Finland expects households to be capable of coping independently for at least 72 hours during serious disruption. Official preparedness guidance recommends keeping enough food, drinking water, medicines and essential supplies to survive for three days while authorities concentrate on restoring critical systems and helping the most vulnerable.

Civil-defence shelters are another part of the system. Finnish guidance says they can protect against hazards including explosions, structural collapse and dangerous substances, while shelters in residential buildings must be capable of being prepared for use within 72 hours when authorities order their activation.

The Kuopio exercise takes that doctrine and stress-tests it at scale.

Inside the Cave

Luola is normally part of civilian life. It is a sports and events facility built underground in Savilahti.

In an emergency it becomes something very different.

Kuopio describes the complex as one of Europe’s most modern civil-defence shelters. During Shelter 2026, its normal civilian function has been replaced by emergency accommodation, command activity and training designed to discover whether thousands of people could actually be protected when normal society stopped functioning.

That dual use is important. A bunker that exists only for war can deteriorate unnoticed for decades. A shelter that remains part of daily civilian infrastructure is continuously occupied, maintained and understood by the people who may eventually need it.

The Kuopio facility can shelter roughly 7,000 people, while the exercise brings together rescue services, municipal authorities, companies, voluntary groups, educational institutions and other regional and national organisations.

The objective is not merely getting people behind thick doors. Authorities are testing whether decisions can still be made, whether information can be shared, whether communications work and whether large numbers of frightened civilians can be managed when familiar systems begin failing simultaneously.

Ukraine Changed the Calculation

Finland’s preparations cannot be separated from what happened in Ukraine.

Russia’s full-scale invasion in February 2022 transformed Finnish security policy almost overnight. A country that had maintained military non-alignment for decades applied for NATO membership alongside Sweden and formally entered the alliance on April 4, 2023. Sweden followed in March 2024.

That decision produced one of the biggest strategic consequences of Vladimir Putin’s invasion outside Ukraine itself. Rather than pushing NATO away from Russia, the war brought the alliance directly onto Finland’s long eastern frontier.

Finland and Russia share a border stretching for more than 1,300 kilometres. NATO said Finland’s accession more than doubled the alliance’s land border with Russia, immediately transforming the strategic geography of northern Europe.

The wider history of Russia, Ukraine and NATO explains why the Finnish decision mattered far beyond Helsinki. Moscow had spent years treating NATO enlargement as a security threat, yet the invasion of Ukraine persuaded another highly capable Russian neighbour that membership was safer than remaining outside.

Finland now benefits from NATO’s Article 5 collective-defence commitment, meaning an armed attack against Finland would engage an alliance-wide response rather than leave Helsinki facing Moscow alone.

But Article 5 does not keep electricity running during a cyberattack. It cannot instantly move every civilian into a shelter. It cannot guarantee mobile networks work, prevent panic or ensure local officials know who controls what during the first chaotic hours of a crisis.

That is where exercises such as Shelter 2026 begin.

The Lessons Finland Is Taking From Ukraine

One of the starkest lessons from Ukraine is that sophisticated shelters are useful only if civilians can reach them before the missiles arrive.

The Kuopio shelter may be capable of accommodating thousands, but wartime experience in Ukrainian cities has shown that warning times can be measured in minutes. People often depend instead on metro stations, underground car parks, basements and whatever solid protection is immediately available.

Finnish preparedness guidance reflects that reality. If a dedicated civil-defence shelter cannot be reached when danger is imminent, people are told that remaining inside the strongest available structure may be safer than attempting a longer journey while an attack is under way.

That makes civilian knowledge part of national defence.

Children and students have been involved in the Kuopio exercise alongside adults. The assumption is deliberately uncomfortable: in a severe crisis, authorities may not immediately be available to tell every citizen what to do.

People may have to act for themselves.

The Russian Threat Is Bigger Than an Invasion

There is another reason Finland’s preparation increasingly matters.

The most plausible confrontation between Russia and NATO may never resemble the opening scene of a traditional war.

Cyberattacks, GPS interference, infrastructure disruption, sabotage, drones, disinformation and other deniable operations create a grey zone between peace and armed conflict. Western governments have increasingly accused Moscow of operating inside that space, while Russia has repeatedly rejected or disputed Western allegations surrounding individual incidents.

For Finland, that means resilience has value even if Russian tanks never attempt to cross the border.

A population capable of surviving without power for several days is harder to destabilise. Infrastructure that can be restored quickly is less attractive to sabotage. Officials who have already rehearsed communications failures are less likely to lose control when a real one occurs.

Civil defence therefore becomes part of deterrence itself.

The objective is not simply to survive an attack. It is to convince a potential attacker that creating chaos will be difficult in the first place.

Finland’s History Makes the Exercise Different

For Finns, preparations against Russia also carry historical weight that would be difficult to reproduce elsewhere in Europe.

Finland fought the Soviet Union during the Winter War of 1939–40 and again during the Continuation War. The country survived as an independent state but lost significant territory, while more than 400,000 people were displaced from areas ceded to the Soviet Union.

Some Finns who experienced those wars as children are still alive.

Accounts gathered around the Kuopio exercise include elderly residents who remember bombing, evacuation and losing their homes. For them, underground shelters and evacuation drills are not abstract symbols of geopolitical tension. They belong to living memory.

That history helps explain why Finland never entirely embraced the assumption that major war in Europe had become impossible.

Ukraine proved that assumption catastrophically wrong.

What Happens Next

Shelter 2026 ends after two days. The security problem it represents does not.

Finland is now protected by NATO, backed by one of Europe’s strongest cultures of civil preparedness and operating from a national defence model built around military forces, reservists, public authorities, businesses and ordinary citizens rather than the armed forces alone.

Yet its geography cannot change. Russia remains next door.

President Stubb may be right that Moscow has little rational incentive to launch an armed attack on NATO. Indeed, the enormous consequences of Article 5 are designed to make precisely that calculation unavoidable.

Finland’s response is to prepare anyway.

Thousands of people sleeping beneath Kuopio, practising radiation monitoring and learning how to function when water, electricity and communications fail are not evidence that war is about to begin. They are evidence that one of Russia’s closest European neighbours no longer believes peace is something that can safely be taken for granted.

James Taylor