An upbeat President Obama returned to Prague Thursday to sign a nuclear arms reduction deal with Russian President Medvedev. The treaty will fulfill a pledge Obama made a year ago.

With just days remaining before a landmark arms control agreement lapses, warnings are mounting about what could follow.

President Barack Obama, capping a far-flung Asian trip of mixed results, assured Russian President Dmitry Medvedev on Sunday that getting the Senate to ratify the START nuclear weapons treaty is a ...

Presidents Barack Obama and Dmitry Medvedev have signed a nuclear arms-cutting pact today in Prague. They’ve agreed to cut their nuclear arsenals by a third while cutting the number of bombers, ...