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Obama limits US nuclear arms use
President Barack Obama's administration has unveiled a defence policy to significantly narrow the circumstances in which the US would use nuclear arms.
The far-reaching Nuclear Posture Review, published on Tuesday, outlines plans for "achieving substantial further nuclear force reductions" beyond the new treaty.
Every president since 1991 conducts such a review - the last one took place in 2001 at the start of George W Bush's administration.
But Mr Obama set high expectations when he declared in Prague last year America's commitment to seek a world without nuclear weapons.
For the first time, the US is ruling out a nuclear response to attacks on America involving biological, chemical or conventional weapons.