Vali Nasr: Have strategic realities in the Middle East changed?

Who’s gained and who’s lost after the killing of Iranian commander Qasem Soleimani? HARDtalk’s Stephen Sackur speaks to Vali Nasr, US foreign policy scholar and former adviser to the US State Department. Phase one of the fallout from America’s assassination of Iran's favourite General 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. What might happen next?