Lithuanian drone manufacturer RSI Europe and Ukrainian developer The Fourth Law have signed a memorandum of understanding to jointly produce drones in Lithuania, the companies announced at the Eurosatory defense exhibition in Paris on June 18, 2026.
The agreement falls under the “Build with Ukraine” framework and was signed by RSI Europe co-founder and CEO Tomas Milašauskas and Yaroslav Tkachuk, director of The Fourth Law’s unmanned aerial systems unit.
Under the memorandum, RSI Europe will prepare manufacturing facilities and produce thousands of drones drawing on technologies developed by The Fourth Law. The Ukrainian company would contribute drone manufacturing and artificial intelligence technologies once the necessary conditions are met, and would provide continuing battlefield feedback intended to keep the systems relevant through their production life. Priority in hiring for the production line will go to Ukrainian citizens.
The Fourth Law develops autonomous small drones and autonomy modules built around computer vision and artificial intelligence, and was among more than 50 Ukrainian companies exhibiting at Eurosatory 2026, which ran from June 15 to 19, 2026.
“The partnership with TFL, leaders in the integration of computer vision and artificial intelligence into drone control, is important both for strengthening Ukraine’s combat capability and for developing the modern battlefield ready capabilities of NATO’s eastern flank,” Milašauskas said.
Localizing Ukrainian drone technology
Founded in Vilnius in April 2022 in response to Russia’s full-scale invasion of Ukraine, RSI Europe builds the Shpak first-person view drone and remote-detonation systems already used by Ukrainian units, several NATO members and allied nations. In May 2026, the company completed its largest contract to date, delivering 9,500 Shpak systems to an undisclosed NATO buyer, with most airframes passed on to the Ukrainian Armed Forces.
The arrangement reflects a wider pattern at Eurosatory 2026 of European manufacturers tying domestic production capacity to combat-tested Ukrainian technology and frontline feedback. On the same day, the United Kingdom pledged 150,000 Ukrainian-produced drones as part of a roughly $1 billion support package.
“This partnership under the ‘Build with Ukraine’ project is aligned with Ukraine’s national interests to strengthen defense technology supply chains for Ukraine and contribute to the security of Eastern Europe,” Tkachuk said. He added that the company was pleased to collaborate with a firm capable of producing defense technology at scale while maintaining regular contact with Ukrainian soldiers.
The agreement comes as Lithuania and its Baltic neighbors press for stronger NATO air defenses following repeated drone incursions along the Alliance’s eastern flank.