The prime minister has re-confirmed the place of the "Blair doctrine" of liberal interventionism in UK foreign policy. He first supported a no-fly zone a couple of weeks ago and was accused of naivety. Now the UN have backed the idea, David Cameron has been treated like a statesman. So which is it? Sir Max Hastings, the military historian and former Telegraph editor and Bronwen Maddox, editor of Prospect magazine, debate the PM's foreign policy objectives.

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