FILE PHOTO: A view of the test-fire of Pukguksong-2 guided by North Korean leader Kim Jong Un

FILE PHOTO: A view of the test-fire of Pukguksong-2 guided by North Korean leader Kim Jong Un

War of words is pushing up the cost of insuring South Korean debt. North Korea's test of the Pukguksong-2 missile in the undated photo released by the Korean Central News Agency (KCNA) in Pyongyang February 13, 2017. Photo: Reuters/KCNA

May 22, 2017 1:28 PM (UTC+8)