PAJU, SOUTH KOREA - JANUARY 06:  A barbed wire fence at a military check point near the demilitarized zone (DMZ) separates South and North Korea on January 6, 2016 in Paju, South Korea. North Korea confirmed it has conducted a hydrogen bomb test after South Korea's Metrological Administration detected an 'artificial earthquake' near  Punggye-ri, North Korea's main nuclear testing site on January 6, 2015.  (Photo by Chung Sung-Jun/Getty Images)