Vladimir Putin has ordered Russia’s first military mobilisation since World War Two. He also warned he would use "all means [he has]" to defend Russian territory, raising concerns around the world and saying it wasn’t a bluff. With the United Nations General Assembly taking place this week, Nato leaders attacked Putin’s announcement. But Nato-Russia relations weren’t always quite so frosty.  In this episode we speak to Lord Robertson, the tenth Secretary General of that alliance, who met Putin 9 times and says that Putin even discussed joining Nato at one point in their conversations. We ask him whether Putin has changed or whether he and the West completely miscalculated what the Russian leader was up to. Sources: AP Archive, CNBC Produced by: Freya Pickford and Nina Hodgson