North Korea Is Warned by Gates on Testing

The defense secretary warned North Korea that the U.S. will not accept it as a nuclear-armed state.

Gates to Reassure Allies in Asia Over North Korea

Defense Secretary Robert M. Gates said that the United States had detected no unusual military movement in North Korea, and had no plans to reinforce American forces in South Korea.

South Korea and U.S. Raise Alert Level

The move was the latest sign of escalating tensions after North Korea conducted its second nuclear test on Monday.

Opinion: North Korea Misfires

Global reaction to the nuclear test is likely to be swift and unforgiving. The repeated provocations will have diminishing returns for Pyongyang.

North Korea Threatens Military Strikes on South

North Korea said it would retaliate if its ships were stopped as part of a U.S.-led anti-proliferation effort.

South Koreans Express Fatigue With a Recalcitrant North

After years of hope that relations with the North would thaw if the South tried to coax it into engagement, regional experts and others speak of growing disenchantment.

Leadership Mystery Amid N. Korea’s Nuclear Work

Political uncertainty and Kim Jong-il’s questionable health are two of the issues that contribute to a diplomatic challenge facing the Obama administration.