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Stephen Sackur speaks to Vali Nasr, US foreign policy scholar and sometime advisor to the state department. Phase one of the fallout from America's assassination of Iranian general Qassem Soleimani appears to be over. Washington and Tehran are both talking tough while taking a step back from the brink of all-out war. For now. But how has the high drama of the last week changed strategic realities in the Middle East? Who's really gained and who's lost as a result of the killing of Iran's favourite general?