The North Korea-South Korea border is considered the most heavily militarized in the world . Hide Caption 8 of 10 Photos:Photos: Militaries and Korean tensions Militaries and Korean tensions Defections over land through the heavily armed and patrolled border area are rare , as most prefer to try crossing by sea or going through China . He is one of three defectors in the past two months , a lawmaker says . The South Korean defense minister apologizes for the security failure .
The North Korea-South Korea border is considered the most heavily militarized in the world . Hide Caption 8 of 10 Photos:Photos: Militaries and Korean tensions Militaries and Korean tensions He is one of three defectors in the past two months , a lawmaker says . The South Korean defense minister apologizes for the security failure .