North Korean state media confirmed Thursday that the country test-fired a newly developed hypersonic missile the previous day, sparking concern over the nuclear-armed nation's technological advances in hard-to-intercept weapons.The launch came after North Korean leader Kim Jong Un pledged late last year to strengthen the nation's defense capabilities, saying the military environment of the Korean Peninsula and the international situation have been "getting instable."Some foreign affairs experts said the test-firing of the missile was aimed at increasing Kim's clout at home, as North Korea's…READ FULL ARTICLE