South Korea admits to conducting "decapitation drills" for possible Kim Jong Un assassination.
South Korean defense minister Shin Won-sik breaks silence on the secret drills after half a decade.
American forces participate in the drills alongside South Korean special operation forces.
Drills involve aerial maneuvers, raids on key facilities, and indoor mop-up exercises.
South Korean joint chiefs of staff confirm secret drills with US Army Special Forces last month.
North Korean leader vows to enhance nuclear arsenal amid plans for three new spy satellites in 2024.
Kim accuses the US of causing political instability and poses military threats to the Korean Peninsula.