Obama Limits When U.S. Would Use Nuclear Arms

http://www.nytimes.com/2010/04/06/world/06arms.html?pagewanted=2

But the president said in an interview that he was carving out an exception for “outliers like Iran and North Korea” that have violated or renounced the main treaty to halt nuclear proliferation.

In the year since Mr. Obama gave a speech in Prague declaring that he would shift the policy of the United States toward the elimination of nuclear weapons, his staff has been meeting — and arguing — over how to turn that commitment into a workable policy, without undermining the credibility of the country’s nuclear deterrent.