World leaders declared progress in safeguarding nuclear materials sought by terrorists and wayward nations, even as President Barack Obama acknowledged the task was far from finished.
By Darlene Superville and Josh Lederman, Associated Press
More than 50 world leaders met for the Nuclear Security Summit, which comes amid fears about terrorists acquiring destructive material, as well as North Korea's growing pace of nuclear tests and missile launches. Chief foreign affairs correspondent Margaret Warner offers…
By PBS NewsHour
WASHINGTON -- President Barack Obama and Chinese President Xi Jinping pledged Thursday to cooperate to confront the North Korean nuclear threat while working to narrow persistent differences over cybersecurity, human rights and maritime conflicts.
By Matthew Pennington and Josh Lederman, Associated Press
WASHINGTON — As North Korea rattles its nuclear saber, threatening to bomb the U.S. at "any moment," a nerve-jangling question hangs in the air: If Pyongyang did launch a nuclear-armed missile at an American city, could the Pentagon's missile defenses…
By Robert Burns, Associated Press
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