Obama breaks with Bush security policy

Barack Obama, the US president, has unveiled a new national security strategy that moves away from the Bush doctrine of pre-emptive strikes to one which stresses international co-operation.

However, the US maintains the right to act unilaterally and it is not softening its push for new sanctions against Iran over its nuclear programme.

Al Jazeera's Patty Culhane reports from Washington.

[May 28, 2010]