Estonia announced the closure of its border with Russia following a sabotage attempt attributed to Russia’s military intelligence service, the GRU

Estonia will close all three border crossing points with Russia starting December 1, after authorities attributed an attempted act of sabotage at a company in the defense industry to Russia’s military intelligence service, the GRU. The announcement was made Sunday by Estonian Foreign Minister Margus Tsahkna.

The incident took place Saturday morning at the premises of drone manufacturer Threod Systems in Viimsi, near Tallinn. Eight Latvian citizens were detained after allegedly attempting to break into the building to cause a fire and an explosion. Security personnel stopped the attack before it caused significant damage, and five of the suspects remained in the custody of the authorities.

Estonia’s Internal Security Service, KAPO, claims that the operation was ordered by the GRU. Threod Systems produces reconnaissance drones and long-range attack drones.

Prime Minister Kristen Michal described the incident as part of Russia’s hybrid war against Europe and said that the measure aims to reduce risks to the population.