US President Barack Obama and Russian President Dmitry Medvedev have sealed an agreement on a landmark nuclear arms reduction treaty.
The two leaders plan to sign the new Strategic Arms Reduction Treaty on April 8 in the Czech capital Prague.
After months of deadlock, the breakthrough marks Mr Obama's most significant foreign policy achievement since taking office and also boosts his effort to "reset" ties with Moscow.
He and Mr Medvedev put the finishing touches on the historic accord during a phone call, committing the world's biggest nuclear weapons powers to big cuts in their arsenals.
Under the 10-year agreement, each side will reduce its deployed strategic warheads to 1,550 from 2,200.
