Latvia Detains Three Over Milrem Robotics Arson in Estonia

Three suspects have been detained in Latvia over a deliberate arson attack on a building used by Estonian defense company Milrem Robotics in Tallinn, with Estonian authorities investigating whether the incident was an act of sabotage and whether Russia was involved. The fire occurred overnight into August 15 at the company's premises in Tallinn's Lasnamäe district, while Milrem Robotics said the incident did not disrupt production or deliveries of unmanned ground vehicles to Ukraine. 

Estonian State Prosecutor Gardi Anderson said current information indicates that all three suspects participated in the arson and that the attack was deliberate and premeditated. A court approved requests to keep two suspects in custody, while Estonian and Latvian authorities are working on their transfer to Estonia. 

The suspects reside in Latvia, according to information provided by the Estonian Internal Security Service. Authorities have not publicly disclosed their identities or established Russian responsibility for the attack. 

Estonia investigates possible Russian involvement

The fire targeted a building used by Milrem Robotics on Betooni Street in Tallinn's Lasnamäe district. Estonian authorities initially treated the incident as a potential arson attack before confirming that investigators believe the fire was deliberately set. 

Estonian Prime Minister Kristen Michal said on August 18 that possible sabotage and Russian involvement were among the lines of investigation. Moscow had not responded to Reuters regarding the incident and has previously rejected European accusations of involvement in sabotage operations. 

Prosecutors have stopped short of attributing the attack to Russia. Anderson said investigators were examining all possibilities, including sabotage, but could not disclose further details while the investigation remains active. 

The distinction is significant because European governments have increasingly warned about suspected sabotage and other hybrid operations targeting infrastructure and organizations connected to military support for Ukraine. Poland and Lithuania have separately warned in 2026 about intelligence indicating risks of Russian attacks against infrastructure in NATO countries. 

Milrem Robotics supplies unmanned ground vehicles to Ukraine

Milrem Robotics develops robotic and autonomous systems for military and security applications. Its portfolio includes the THeMIS unmanned ground vehicle and other military robotic platforms. 

The company's systems have been deployed in Ukraine, making the Tallinn facility relevant to the wider European defense supply chain supporting Kyiv.

Russia had already demonstrated specific interest in Milrem Robotics technology. In 2022, a Russian organization announced a reward for the capture and delivery of a THeMIS unmanned ground vehicle operating in Ukraine, according to ERR. 

Milrem Robotics Chief Executive Officer Kuldar Väärsi said the August arson did not affect production, supply chains or scheduled deliveries to Ukraine. More than 200 Milrem robotic systems are expected to be operating in Ukraine by the end of 2026, according to reporting on the company's current deployment plans. 

Latvia arrests add cross-border dimension to investigation

The detention of all three suspects in Latvia makes the investigation a cross-border security case involving two NATO and European Union members.

Estonian and Latvian law enforcement agencies are cooperating on the investigation. Two suspects have been remanded in custody, while authorities were expected to make a decision concerning the detention status of the third suspect. 

Estonian authorities intend to transfer the suspects from Latvia to Estonia. Prosecutors have not disclosed their nationalities, alleged motives or details about how the attack was organized.

The case therefore remains an arson and potential sabotage investigation rather than an established Russian operation. Any assessment of state involvement will depend on evidence gathered by Estonian and Latvian investigators.

Baltic defense industry faces expanding security challenge

The attack comes as Estonia, Latvia and Lithuania accelerate investment in domestic defense production and military infrastructure.

Estonia is developing new ammunition manufacturing capacity at the North Kiviõli defense industry park. Turkish defense company ARCA plans to invest approximately €300 million in an Estonian ammunition factory focused primarily on 155 mm artillery ammunition, with production planned from 2028. 

Latvia is simultaneously expanding its defense-industrial cooperation with Ukraine. Riga and Kyiv announced plans in June 2026 for a joint drone manufacturing facility in Latvia's eastern Latgale region, close to the Russian and Belarusian borders. 

The growth of defense production across the Baltic states increases the importance of physical security around factories, technology companies and supply chains. Companies supporting Ukraine can represent particularly sensitive targets because disruption can affect both national defense programs and equipment deliveries to Ukrainian forces.

The Milrem Robotics incident now provides a concrete test for Baltic counter-sabotage cooperation. Three suspects are in Latvian custody, but investigators still need to establish who organized the attack, what motivated it and whether the suspected arson was connected to a wider operation.

What happened at Milrem Robotics in Tallinn?

A fire was deliberately set at a building used by Milrem Robotics in Tallinn's Lasnamäe district overnight into August 15, 2026. Estonian prosecutors describe the incident as premeditated and are investigating it as potential sabotage. 

Who was arrested over the Milrem Robotics arson?

Three suspects were detained in Latvia. Estonian authorities say the suspects reside in Latvia and believe all three participated in the arson, but their identities and nationalities have not been publicly disclosed. 

Is Russia suspected in the Milrem Robotics fire?

Possible Russian involvement is one line of investigation identified by Estonian Prime Minister Kristen Michal. Estonian authorities have not established or publicly attributed responsibility for the attack to Russia. 

Did the attack disrupt Milrem Robotics deliveries to Ukraine?

No disruption has been reported. Milrem Robotics said its production, supply chains and scheduled deliveries of military robotic vehicles to Ukraine remained unaffected.