The US isn’t ready to detect and defend against hostile drone attacks, a detection company warned, echoing concerns raised by others about a growing threat.Drones have become a defining weapon in Ukraine and a growing threat in the Middle East, underscoring how cheap, accessible systems can create serious security challenges abroad and at home.Companies working on counter-drone technology warn that the US isn’t ready to meet the threat.”I’m very concerned,” Kristian Brost, the general manager…