North Korea nuclear test did not increase technical capability - U.S.

By Andrea Shalal, David Brunnstrom and Jonathan Landay WASHINGTON (Reuters) - North Korea's Jan. 6 nuclear test did not expand its technical capability, but the U.S. government is keeping a close eye on Pyongyang's efforts to develop a thermonuclear warhead capable of reaching the United States, the head of the U.S. Missile Defense Agency said on Tuesday. "I would assess that their technical capability has not increased," Vice Admiral James Syring told an event hosted by the Center for Strategic