North Korea’s continued construction of minefields, fences and barriers along the Military Demarcation Line (MDL) is raising questions over whether its border fortification campaign is changing the role of the Demilitarized Zone (DMZ), which has served as a military buffer between the two Koreas since the 1953 Korean Armistice Agreement. The risks are becoming more apparent as North Korea builds fortifications close to the MDL in areas where Seo…