A British SkySpyke anti-drone system by Quell is seen during the international military exercise Baltic Trust 25 at the Selonia military training ground near Viesite, Latvia, on Aug. 27. The proliferation of uncrewed systems in the Ukraine-Russia war has highlighted the importance of drone defense capabilities. But the dilemma militaries around the world face is that the attack weapons tend to be far cheaper than the response to destroy them. Drone costs can range from just a few hundred to several thousand dollars, and their price tag is rapidly depreciating as innovation and mass production pick up. Efforts to solve that conundrum were on display this week at the DSEI defense expo in London, where the halls were packed with lasers, missiles, jammers and even other drones designed to defeat small, uncrewed threats. What they all had in common was an attempt to bring down the cost per kill."