SKorean Leader: Military Failed to Spot Defector South Korea's president has rebuked the military for its failure to spot a North Korean soldier before he crossed the two countries' heavily armed border last week. Officials say the soldier knocked on the door of a South Korean barracks near the border last Tuesday and told troops there he was defecting. North Korean soldiers, back, look at the southern side as South Korean soldiers, foreground, stand guard at the border village of Panmunjom that separates the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, Oct. 9, 2012. (AP Photo/Hye Soo Nah) Close The incident has prompted criticism of the military's surveillance capabilities. President Lee Myung-bak summoned the defense minister Thursday and said those responsible for the failure should be punished. Officials say the front-line unit also falsely claimed that it had spotted the North Korean on a surveillance camera. On Saturday, another North Korean soldier defected across the border after killing two superiors. Such crossings are unusual. The Koreas remain technically at war after their 1950-53 conflict ended in a truce.