Ukraine says heavy bomber drones air-dropped exploding war robots miles behind Russian lines during a secretive operation

Ukraine is increasingly using robots to fight, and says dropping them with drones behind Russian lines is helping to retake territory.Ukrinform/NurPhoto via Getty ImagesA Ukrainian unit said it air-dropped explosive-laden war robots behind Russian lines.The Third Army Corps said it pioneered air-deploying ground robots.The unit said it took ground in Operation Vivaldi, which remains largely secret.A Ukrainian unit used heavy bomber drones to drop war robots behind Russian lines as part of a secr