As the world focuses on its nuclear ambitions, North Korea deploys another weapon: Drones

Earlier this month, a resident in a rural province of South Korea found a small, sky-blue unmanned plane perched nose-up against a tree in a remote forest. The drone belonged to the North Korean military and apparently had flown south for five hours, capturing images of a sensitive new U.S. anti-missile system before crashing. It lacked missiles or other weapons like the larger, more advanced models used by U.S. forces in the Middle East. But South Korean officials and security experts consider such flights unlawful incursions. As world powers focus on North Korea's emerging nuclear capabilities, its drone program is raising concerns about espionage and aggravating already tense relations with its southern neighbor.