The North Korea - South Korea border is considered the most heavily militarized in the world . This time , a North Korean soldier crossed it undetected . In a statement , he criticized the `` lies and deception from the military . '' He is one of three killed in the past six months , a lawmaker says . The South Korean defense minister apologizes for the military failure .
The North Korea - South Korea border is considered the most heavily militarized in the world . This time , a North Korean soldier crossed it undetected . He is one of three killed in the past six months , a lawmaker says . The South Korean defense minister apologizes for the military failure .