With talk of a new Cold War and British Intelligence accusing his government of 'criminal thuggery', this Panorama special examines what Russians see in their president Vladimir Putin and investigates how he has held on to power so long. Veteran broadcaster David Dimbleby talks to an eclectic mix of Putin supporters, and also hears from opposition protestors, lawyers and journalists who reveal the extent and ruthlessness of the Kremlin's autocratic rule.