(BBC.co.uk) — Barack Obama is set to announce a new defence strategy that would reduce the circumstances in which the US would be prepared to use nuclear weapons.
It would rule out a nuclear response to attacks on the US involving biological, chemical or conventional weapons.
Nor would the US use nuclear arms on non-nuclear states that comply with the nuclear non-proliferation treaty.
Mr Obama said he would make exceptions for states deemed in violation of the treaty, naming Iran and North Korea.
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