Sensofusion Oy: Finland's Sovereign Bet on Counter-Drone Defence

Analysis as of 30 December 2025.

Sensofusion Oy is one of the more instructive cases in Europe's scramble to answer the small-drone threat. The Vantaa-based company, incorporated in 2016 as a privately held Oy, built its business around its flagship product, Airfence, a counter-UAS system that listens rather than looks. Instead of radar, Airfence relies on passive radio-frequency sensing, with machine-learning classifiers that identify a drone from its signal signature, triangulate its position, and — a distinctive feature — locate the operator on the ground. Neutralisation is electronic: directional jamming or takeover of the control link, with no kinetic effector. Founder and chief executive Tuomas Rasila, an electronics engineer, remains the company's largest stakeholder, and the venture grew out of his own development work rather than a university lab.

What sets Sensofusion apart from most European defence SMEs of its size is how far its kit has travelled. Finnish troops carry hand-held Airfence units in the field, and media reporting places the system with Ukrainian units as well — operational exposure that supports a top-tier readiness assessment for the core detection and soft-kill functions. Across the Atlantic, the technology has passed through the US Marine Corps' experimentation programme and won approval from the Defense Innovation Unit, while the company has worked on requirements with NASA and the FAA. Commercially, over ninety-five per cent of sales go abroad, to EU and NATO allies and partners; the footprint includes a subsidiary in New York, representation in South Korea and Kuwait, and, as of 2025, new development teams forming in Canada and the United States. At home, the company received a presidential internationalisation award, handed out by President Stubb.

The paradox is the near-total absence of a European programme record. Sensofusion's only formal EU engagement was the Horizon 2020 SECOPS project (2017–2019), a drone-security research effort alongside NLR, Unifly and Delft Dynamics. Public records show no EDF or EDIDP awards, no PESCO consortium membership, and no place in DIANA or the NATO Innovation Fund portfolio. Funding has been essentially private and national — Business Finland export and R&D grants among the known instruments — leaving the firm with close to zero dependency on Brussels money. It holds no identifiable European patents either, relying on know-how rather than a patent portfolio, with its technical assets retained in Europe.

The timing makes this profile strategically salient. Finland joined NATO in 2023 and, as Reuters reported in December 2025, has been reinforcing its anti-drone posture amid concern over Russian drone activity. A Baltic "drone wall" has been proposed, and Sensofusion has been named as a potential contributor to building it. For planners worried about dependence on non-allied electronics, a fielded, Finnish-engineered system sourced from Western component suppliers is precisely the kind of asset the strategic-autonomy agenda calls for — yet it sits in a company employing on the order of twenty to fifty engineers.

The limits are as clear as the strengths. An RF-centred architecture struggles against drones that emit nothing to intercept, such as fibre-optic-guided types; a soft-kill-only portfolio leaves the hard-kill layer to partners; Airfence today operates as a stand-alone kit rather than a node fused into national air-defence networks; and both swarm saturation and large-volume manufacturing would stretch a firm of this size.

The report closes on the questions this configuration raises rather than on reassurance: whether a detection philosophy built on radio emissions can stay relevant as emission-silent drones proliferate; whether a jam-and-hijack specialist can anchor a layered defence without a hard-kill partner, and who that partner would plausibly be; whether staying outside EDF, PESCO and DIANA reflects commercial discipline or a structural weakness that will tell when Baltic-scale procurement arrives; whether a know-how-based IP strategy with no patent shield protects or exposes the company; and whether a workforce this small can industrialise fast enough for the demand now forming on NATO's eastern flank.