Stephen Sackur talks to General Sir Richard Barrons, who led the UK's Joint Forces Command and fought in wars from the Balkans to the Middle East and Afghanistan. The military threats facing the Western world have changed dramatically. The West's military doctrine and capabilities have failed to keep up. That's Sir Richard's view, not an outside observer, but until 2016 one of the most senior generals in the British armed forces. How vulnerable is the West in the new balance of global military power?
