Estonia Says Russia Ordered the Arson at a Defense Plant Supplying Ukraine — but Has Yet to Answer It

On the night of August 15, a fire broke out in a building on Betooni Street in Tallinn's Lasnamäe district. The building is used by Milrem Robotics — an Estonian company that makes THeMIS unmanned ground vehicles, robotic platforms Ukraine uses to evacuate wounded soldiers and haul ammunition without risking a crew.

The fire was put out quickly. No one was hurt. At the time, it looked like an ordinary incident.

A month and a half later, the picture changed completely. On September 29, Estonian Prime Minister Kristen Michal said the arson was an act of sabotage ordered by Russian intelligence services, based on an assessment by the country's Internal Security Service — the counterintelligence agency known locally as ISS or KaPo.

The arrests came earlier. On August 17, Latvian police detained two suspects — both Latvian citizens; a third was held the next day. Data storage devices and items believed to have been used in the arson were seized.

On September 17–18, Latvia extradited all three to Estonia, where a court remanded them in custody. ISS Director General Margo Palloson then delivered a remark worth reading twice: the Milrem arson was the first successful attack on Estonia ordered by Russian intelligence this year.

The first successful one. Which means there were others — attempts that failed. How many were prevented, the service has not disclosed.

Why would Moscow target a factory in the Baltics? The answer is not subtle. Milrem is not just a defense contractor; it is part of Europe's supply chain for unmanned ground systems used by Ukraine's military. Disrupting that production means striking not at Estonia, but at the pipeline that keeps Ukrainian forces supplied.

Nor is this an isolated case. The Institute for the Study of War has documented a series of Russian attacks on Europe's defense industry, from arson to sabotage. The logic of the campaign is straightforward: if you cannot beat the weapons on the battlefield, burn the factories that make them — preferably through proxies, which may explain why the suspects here were Latvian nationals.

Now to the part that raises the hardest questions. Estonian Foreign Minister Margus Tsahkna said Russia's chargé d'affaires was summoned to the Foreign Ministry on September 29. Estonia, he said, "reserves the right to respond" to what he called hostile, irresponsible and dangerous activity — and its answer would be "the exact opposite" of what Moscow expects: more sanctions, tighter entry restrictions for Russian citizens, and continued support for Ukraine.

Strong words. But note what is missing: any concrete measures. A diplomatic summons is a ritual Europe has performed dozens of times. And the obvious question follows: what happens if next time it is not a wall that burns, but the factory itself?

This is where NATO's core dilemma comes in. Article 5 — the alliance's founding promise — covers an armed attack. An arson attempt that was quickly extinguished, with no casualties and no destroyed production line, formally falls below that threshold. Moscow understands this perfectly and operates just beneath it: enough to hurt, not enough to trigger war.

NATO Secretary General Mark Rutte's response was cautious. Russia's hybrid campaign, he said, will not stop support for Ukraine — and alliance responses to attacks will "not always be public or mirrored." Translated from diplomatic: we will do something, but we won't tell you. Reassuring? Debatable.

The Kremlin, unsurprisingly, denies everything. Press secretary Dmitry Peskov called the accusations "unfounded, ill-considered, absolutely inconsistent with reality and devoid of any logical basis." It is the standard formula — the same one Moscow used while European courts and police forces quietly assembled evidence in earlier sabotage cases across the continent.

The criminal investigation is ongoing. Estonia has not named which Russian agency — the GRU, SVR or FSB — allegedly ordered the operation, nor disclosed the suspects' identities, the recruitment scheme or the method used. The extent of the damage has not been made public either. There is a formal attribution, in other words, but not yet a full picture.

One day before the announcement, on September 28, Defense Minister Martin Herem said Estonia would keep committing 0.25% of its GDP to military aid for Ukraine despite the threats. For one of NATO's smallest members, that is serious money — and that is the point: Tallinn is openly refusing to change its behavior over a fire.

But keep this in mind. If the answer to state-ordered sabotage remains a summons and a pledge to "reserve the right to respond," Moscow's arithmetic stays simple: the cost of an attack is zero, the effect is fear and erosion of confidence in Europe's defense industry. Until that equation changes, the next arson is a matter of when, not if.

Three suspects sit in an Estonian prison. The investigation continues. And Europe is once again facing a question it has yet to answer: how many more factories have to burn before hybrid war officially stops being "hybrid"?