Hardtalk is at Nato headquarters in Brussels to speak to the organisation\u2019s Secretary General, Jens Stoltenberg. In some ways it is just like old times \u2013 Moscow is once again seen to pose a threat to Europe\u2019s eastern flank. Nato leaders promise a robust, collective response. But a generation on from the Cold War - are they serious? The western world\u2019s military alliance has a proud history, but does it have a future?