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Page last updated at 12:33 GMT, Thursday, 8 April 2010 13:33 UK

Iran 'will still face nuclear retaliation'

President Obama has announced a new defence strategy to significantly narrow the circumstances in which the United States would be willing to use nuclear weapons, including ruling out a nuclear response to attacks involving conventional, biological or chemical weapons.

Lawrence Korb, a senior fellow at the Center for American Progress and former assistant secretary of defence under Ronald Reagan, examines the change in US nuclear policy.


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