By Jack Kim SEOUL (Reuters) – North Korean leader Kim Jong Un told the country’s military commanders the most powerful means must be mobilized to destroy the United States and South Korea if they choose military confrontation, state media reported on Monday. Kim said the danger of an armed confrontation on the Korean peninsula is fast becoming a reality because of hostile maneuvers by the enemies including the United States, requiring the country to “sharpen the treasured sword” to protect itself. “If the enemy opt for military confrontation … our army should deal a deadly blow to thoroughly…