news night station: U.S. think tank says at least 13 undeclared missile bases identified in North Korea

U.S. think tank says at least 13 undeclared missile bases identified in North Korea

A U.S. think tank said on Monday it had identified at least 13 of an estimated 20 undeclared missile bases inside North Korea, underscoring the challenge for American negotiators hoping to persuade Pyongyang to give up its nuclear weapons and long-range missiles.