Estonia has accused Russia of ordering an August arson attack on Milrem Robotics, a defence company in Tallinn that supplies unmanned ground vehicles to Ukraine. 

Estonian Foreign Minister Margus Tsahkna said the attack was an act of sabotage directed by Russian intelligence services.

Estonian authorities say the suspects have been arrested and no longer pose a threat.

Russia has rejected Estonia’s accusation, and Tallinn has summoned the Russian ambassador over the incident, Al-Jazeera has reported.

The case adds to Estonia’s concerns about what it describes as Russian hybrid activities, including sabotage and other operations targeting NATO countries.