German security services believe Russia was preparing to assassinate the head of a company that supplies drones to Ukraine, according to Die Zeit. Two suspected agents who surveilled him have been arrested, and officials warn the case marks a deadlier turn in Russian operations inside Germany.
Surveillance of a drone-maker
Investigators say the target is Stefan Thumann, head of the Bavarian startup Donaustahl, which makes reconnaissance and kamikaze drones for Ukraine. In December 2025, a recruit filmed his home and photographed the nameplate, focusing on the man rather than the company, security services believe. Thumann has been outspoken against Moscow, posting that "Russia doesn't want peace. It wants the destruction of the West."
Two arrests
A foreign intelligence service flagged Thumann as high-risk in December 2025. Bavarian police arrested Serhii N., a former bricklayer from Kharkiv with no intelligence training, then released him before analyzing his phones. The devices later showed contact with Russian intelligence and attempts to trail his father, investigators found. He fled to Spain, and a Romanian woman, Alla S., continued the surveillance. Both were arrested in March 2026, in Spain and North Rhine-Westphalia.
Fourth suspect arrested in arson attack on Czech factory that made drones and thermal optics for Ukraine
Russia recruits such disposable agents online, paying people from precarious backgrounds for surveillance, arson, and sabotage, and discarding them afterward. Ukraine's own SBU security service has reported dozens of cases in 2026 of Russia recruiting Ukrainians at home for arson and sabotage, often by forging Ukrainian security summonses to pose as their own government.
The BfV, Germany's domestic intelligence service, classifies the case as a suspected planned assassination. A federal investigating judge was not convinced, so the arrest warrant cites only suspected intelligence-agent activity. Lawyers for both suspects declined to comment.
A French factory that makes drones for Ukraine was firebombed with Molotov cocktails
A widening threat
A second German arms company is reportedly in Russian intelligence's sights, investigators say. On 11 June, Serbian officers stopped a truck of concealed explosives apparently bound for Bavaria, home to Donaustahl, Quantum Systems, and Helsing.
The threat has precedent: agents had Rheinmetall chief Armin Papperger watched in 2024, and an FSB killing struck a Georgian exile in Berlin in 2019. It fits a broader Russian sabotage campaign across Europe.
Thumann, now under guard, still taunts Moscow:
"You won't break me."
