South Korea will continue taking necessary measures based on clear principles in response to the recent mine blast in the Demilitarized Zone (DMZ),... National Security Adviser Wi Sung-lac speaks during a parliamentary audit session at the National Assembly in Seoul, Thursday. Yonhap South Korea will continue taking necessary measures based on clear principles in response to the recent mine blast in the Demilitarized Zone (DMZ), the country's top security adviser said Friday.