Ukraine's drone campaign plans to exhaust Russia's air defenses, disable its bombers, and damage military production, says spy chief

• Ukraine's head of defense intelligence discussed his military drone campaign with The Economist.
• He said Ukraine is targeting air defenses, military sites, and military production facilities.
• Ukraine last week used drones to blow up an air defense system in occupied Crimea. 

Ukraine has launched a drone campaign that plans to exhaust Russia's air defenses, disable its bombers, and damage military production, according to Ukraine's head of military intelligence.