Estonia says Russia ordered the August arson attack on Milrem Robotics’ Tallinn premises, an Estonian defense company supplying Ukraine with military ground robots.

Russian sabotage operations have been expanding across Europe in recent months, targeting companies, infrastructure and supply chains connected to Ukraine’s defense effort. European authorities have linked or investigated suspected Russian involvement in arson and other sabotage attempts in several countries, as Moscow seeks to disrupt support for Ukraine and intimidate its European backers.

Foreign Minister Margus Tsahkna said on 29 September that information gathered by Estonia’s Internal Security Service showed the fire at Milrem’s Tallinn premises on the night of 14–15 August was a Russian intelligence-directed sabotage operation. Estonia summoned Russia’s chargé d’affaires over the attack.

Three suspects detained

Estonian authorities had already detained three suspects in connection with the arson, with the suspects apprehended in Latvia. Tsahkna said the perpetrators had been taken into custody and no longer posed a threat to Estonia.

Russia’s attempts to divide, intimidate and sow confusion will fail.

Every act of sabotage only strengthens Allied resolve, increases pressure on Russia and reinforces support for Ukraine.

We will continue to expose, deter and respond. No stone will be left unturned. https://t.co/JfdSbAUGi1

— Margus Tsahkna (@Tsahkna) September 29, 2026

When the investigation was first announced in August, Estonian authorities had not publicly established a Russian connection or disclosed evidence linking Moscow to the fire.

Milrem supplies robots to Ukraine

Milrem Robotics makes THeMIS unmanned ground vehicles, which have been used by Ukrainian forces since 2022 for tasks including transporting ammunition, food and other supplies, evacuating wounded troops, and mine clearance.

The company said in August that the fire had not disrupted its production or deliveries to Ukraine. More than 200 of its robotic systems are expected to be operating in Ukraine by the end of 2026, including more than 150 vehicles funded by the Netherlands.

The attack is part of a growing series of suspected sabotage operations targeting companies and facilities connected to Ukraine’s defense effort. In August, Slovak authorities foiled an attempted arson attack on a Ukrainian drone factory, while European investigations have also examined suspected Russian involvement in attacks on defense-related facilities in Czechia, Lithuania and Bulgaria.

Estonia says sabotage will not weaken Ukraine support

Tsahkna said Russia’s campaign is intended to intimidate European countries, divide allies and weaken their support for Ukraine.

“Russia’s sabotage campaign will not achieve its objectives,” the Estonian Foreign Ministry said, adding that Estonia and its allies would continue increasing pressure on Russia and supporting Ukraine.

Tsahkna said Estonia would respond to the attack by increasing both its support for Ukraine and pressure on Russia.

Ukrainian defense-tech firm BlueBird Tech has begun renting out its Hrets electronic-warfare jammers by the day, in what it calls Ukraine's first such service, the company said on 29 September 2026. Electronic-warfare gear—the devices that scramble the radio links attack drones rely on—is normally bought outright, renting lets a user take a system for a single mission or test it before committing.

The pull is a war where cheap first-person-view (FPV) drones have made portable jamming a routine need, one many users face only for a stint.

How renting works

After paperwork and a deposit equal to the device's full price, the system is handed over, and that handover counts as day one. Each day's rent is then drawn from the deposit, return the system working and undamaged and the renter gets back what is left. Keep it long enough that the fees add up to the full price, and the jammer passes to the renter automatically. Renting is open to individuals, companies, charities, and volunteer groups.

Three models, and what each one jams

The Hrets XL is a modular FPV jammer built from two to 10 working modules, priced case by case. The vehicle-mounted Hrets 4MC is an anti-drop system that jams DJI Mavic-type quadcopters—the drones Russian forces use to drop munitions—for about $56 a day. The lightweight Hrets 4M jams FPV drones at a stated 70 to 400 meters for about $67 a day. One Ukrainian firm has even packed detection, decoding, and jamming of an FPV signal into a single device.