Estonia has publicly accused Russian security services of commissioning an arson attack on a defence factory in Tallinn, in what officials describe as part of a wider Russian sabotage campaign across Europe. The Estonian Internal Security Service (KAPO) said on September 29, 2026, that a fire which broke out overnight on August 14–15 at a building used by Milrem Robotics was a "deliberate and pre-planned act" ordered by Moscow. Milrem's THeMIS unmanned ground vehicles are in service with Ukrainian forces, making the company — according to Tallinn — a logical target in Russia's shadow war against Europe's defence industry.
Table of Contents
- A Six-Week Investigation Concludes Sabotage
- What Happened at the Milrem Facility
- Three Latvian Suspects Detained
- Why Milrem Matters to Ukraine
- Moscow's Denial and the Diplomatic Fallout
- A Pattern of Sabotage Across Europe
- Key Takeaways
- Frequently Asked Questions
- Sources
- Read Next on Chronicle
A Six-Week Investigation Concludes Sabotage
After six weeks of investigation, Estonia's government said it could say "with full confidence" that the fire at the Milrem Robotics building was an act of sabotage commissioned by the Russian Federation's special services, according to Defense News. Prime Minister Kristen Michal said the conclusion rested on intelligence gathered by KAPO during the investigation.
KAPO stated that the attack's modus operandi was "consistent with other acts of sabotage carried out in Europe on behalf of Russia," and assessed that the attack "is directly attributable to the Russian Federation," the Associated Press reported. Estonia did not publicly disclose its underlying evidence, citing the confidentiality of security-service sources.
What Happened at the Milrem Facility
The fire was first spotted by residents in the Lasnamäe neighbourhood of Tallinn during the night of August 14–15 and was brought under control quickly, Estonian media reported at the time, as recounted by Defense News. Authorities in Tallinn had treated the case as suspected sabotage from the outset.
Milrem Robotics bills itself as the "world leader in the autonomous unmanned ground vehicles domain" on its website. The company told Breaking Defense that the arson had no material impact on operations or on vehicle deliveries to customers, and declined to speculate on the motive, saying that was a matter for the criminal investigation.
Three Latvian Suspects Detained
Two Latvian citizens were detained in Latvia on August 17, with a third following a day later, and the suspects were subsequently handed over to Estonia, according to Defense News. The detentions do not by themselves establish who ordered the attack — that attribution rests on KAPO's intelligence assessment, which remains classified.
Why Milrem Matters to Ukraine
Milrem's flagship product, the THeMIS unmanned ground vehicle, is one of the battlefield robots most closely associated with Ukraine's war effort. According to Breaking Defense, 15 of the vehicles were operational in Ukraine as of October 2025, and Kyiv is due to receive more than 150 additional units through a programme funded by the Netherlands. The Emirati defence conglomerate EDGE Group has held a majority stake in the company since 2023.
KAPO warned that defence-industry companies — particularly those involved in drone technology and organisations supporting Ukraine — have been among the targets of Russian security services since the beginning of Russia's war of aggression against Ukraine, Breaking Defense reported.
Moscow's Denial and the Diplomatic Fallout
Kremlin spokesman Dmitry Peskov dismissed the accusation as "unfounded, ill-considered, absolutely not reflecting the reality, not containing any substantiation whatsoever," the Associated Press reported. Estonia's foreign minister summoned Russia's chargé d'affaires in Tallinn over the incident, calling the actions "absolutely unacceptable."
Sweden's prime minister said the case was "extremely serious" and that Stockholm stood fully behind Estonia, Reuters reported. NATO Secretary General Mark Rutte has separately said alleged Russian sabotage and other hybrid operations would not force NATO countries to reduce their support for Ukraine.
A Pattern of Sabotage Across Europe
Estonia's accusation fits a pattern Western officials have described for years. Moscow has been widely accused of running a campaign of sabotage and disruption aimed at undermining support for Ukraine and destabilising European nations. The Associated Press has tracked around 200 incidents of sabotage and malign activity across Europe attributed to Russia since the full-scale invasion of Ukraine began on February 24, 2022.
The central allegation remains disputed: Estonia says its intelligence assessment provides grounds to attribute the attack to Russian security services, while Moscow denies any responsibility and the criminal case continues.
Key Takeaways
- Estonia's Internal Security Service concluded the August 14–15 fire at a Milrem Robotics building in Tallinn was arson commissioned by Russian special services.
- Three Latvian suspects were detained and handed over to Estonia; the case continues as a criminal investigation.
- Milrem supplies THeMIS unmanned ground vehicles to Ukraine, with more than 150 additional units due under a Dutch-funded programme.
- The Kremlin called the accusation baseless; Estonia summoned Russia's chargé d'affaires and drew statements of support from Sweden and NATO.
Frequently Asked Questions
What is Milrem Robotics?
Milrem Robotics is an Estonian defence company specialising in robotic and autonomous systems, best known for its THeMIS unmanned ground vehicle. The company is majority-owned by the UAE's EDGE Group and supplies vehicles to Ukraine.
When did the arson attack happen?
The fire broke out overnight on August 14–15, 2026, at a building used by Milrem Robotics in Tallinn's Lasnamäe district. It was spotted by residents and quickly contained.
How did Estonia link the attack to Russia?
Estonia's Internal Security Service (KAPO) conducted a six-week investigation and concluded the attack was "a deliberate and pre-planned act commissioned by Russian security services," saying its methods matched other sabotage carried out in Europe on Russia's behalf. The underlying evidence has not been made public.
What has Russia said?
Kremlin spokesman Dmitry Peskov dismissed the claims as unfounded and unsubstantiated, saying Moscow "cannot take such statements seriously." Russia has repeatedly denied involvement in alleged sabotage operations across Europe.
Has the attack affected Ukraine's robot deliveries?
No. Milrem said the arson had no material impact on the company's operations or on vehicle deliveries to customers, including Ukraine.
Sources
- Reuters — September 29, 2026: "Estonia says Russia ordered August arson attack on defence company."
- Associated Press via LA Post — September 30, 2026: "Estonia blames Russia for arson attack on defense company that provides vehicles to Ukraine."
- Breaking Defense — September 2026: "Estonia accuses Russia of ordering August arson attack on Milrem."
- Defense News — September 29, 2026: "Estonia blames Russia in arson attack on military robotics firm Milrem."
