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It's hard to imagine how the US-Russia relationship could be any more dysfunctional. Each accuses the other of consistently malign action and intent. 'Worse than the Cold war' was the way it was described by Russia's foreign minister. And yet, the two presidents - Trump and Putin, appear to have some regard for each other. What does it all mean? HARDtalk's Stephen Sackur speaks to former US ambassador to Russia, and Obama adviser - Michael McFaul. How deep does the poison in the relationship run?