The U.S. military needs to invest in radars and other defenses to protect stateside military bases against small drones, experts said.

On Sunday, more than 100 Ukrainian drones struck air bases deep inside Russia. According to some estimates, the operation dubbed ‘Spider Web’ may have successfully damaged or destroyed up to a third of Russia’s fleet of strategic bombers. So what impact might this have on its aerial capability?

Ukraine said it had used 117 drones to target airfields deep in Russian territory. The daring attack demonstrated low-cost precision strikes accessible to almost any state or militant group.