Obama heads to Prague to sign arms deal

President Barack Obama is taking the first major step in his push toward a nuclear-free world, returning to Prague to sign the kind of arms-reduction treaty with Russia unseen for almost two decades.

The new treaty, to be signed Thursday by Obama and Russian President Dmitry Medvedev, will shrink both nations' arsenals of strategic nuclear warheads to 1,550 over seven years, about a third less than the 2,200 currently permitted. reductions. (AP)