Lithuania Deploys Ukrainian SkyFortress Acoustic Drone Detection System

Lithuania is deploying a pilot version of the Ukrainian SkyFortress system to detect low-flying drones using acoustic signatures or radio signals.

The Ministry of National Defence of Lithuania reported this on October 2.

The Lithuanian Defence Minister explained thatLithuania is adapting solutions already in use in Ukraine to strengthen the entire air-defense chain – from surveillance to the interception and neutralization of threats.

“Instead of creating everything from scratch, we are adapting systems that are already operating in Ukraine,” said Lithuanian Defence Minister Robertas Kaunas.

Using artificial intelligence, the system detects and tracks low-flying drones and cruise missiles. It can classify objects in real time based on their acoustic or electromagnetic signatures.

The deployment is covered by a contract signed in the summer of 2026. The agreement also includes sensor data processing, the use of acoustic and radio-frequency signature libraries based on unclassified information, and personnel training.

There is still little detailed public information available about SkyFortress. According to UNITED24 Media, as of July 2025, Ukraine’s Sky Fortress network consisted of around 14,000 acoustic sensors. Each device cost approximately $400–$1,000.

The acoustic data collected by the sensors is combined with radar information and transmitted to mobile fire teams equipped with tablets. In the early versions of the system, mobile phones were used to process the data, helping speed up development. The team later developed dedicated hardware with its own processors and sound cards.

A project engineer told the publication that the developers had reached the third generation of the devices by mid-2025.

As Militarnyi previously reported, the Commander-in-Chief of the Lithuanian Armed Forces announced that the Ukrainian acoustic system would be deployed in Lithuania starting in 2026. He said preparations had been delayed by bureaucratic procedures and the need to adapt the Ukrainian system to U.S.-made equipment.

Reports of NATO countries showing interest in Ukraine’s Zvook and Sky Fortress acoustic monitoring systems first emerged in July 2024.

At the time, Sky Fortress was demonstrated to representatives from 11 NATO member countries at a European military training ground. During the demonstration, the system detected and tracked simulated cruise missiles and drones.