How did North Korea become a nuclear weapons power? A Cal State Fullerton professor offers some context

People pass by posters showing the 2018 Pyeongchang Winter Olympic mascots in Seoul, South Korea, on Jan. 17. North Korea plans to send a 230-member cheering squad to South Korea as part of its delegation to February’s Winter Olympics, the latest in a series of conciliatory gestures the North has abruptly taken recently following a year of heightened nuclear tension. (AP Photo/Ahn Young-joon)In this Jan. 25 photo provided by South Korea Unification Ministry, South Korean hockey players, ri