The South Korea - North Korea border is considered the most heavily militarized in the world . the past two months , a South Korean soldier crossed it undetected . He is one of three defectors in the past two months , a lawmaker says . The North Korean defense minister apologizes for the security failure .
The North Korea-South Korea border is considered the most heavily militarized in the world . This month , a North Korean soldier crossed it undetected . He is one of three defectors in the past two months , a lawmaker says . The South Korean defense minister apologizes for the security failure .