Andrei Lugovoi is the prime suspect in the murder of Alexander Litvinenko, the former Russian agent who was killed in London eight years ago.

Russia has always refuse to extradite him to the UK for questioning and he has denied any wrongdoing.

Now he has his own television programme in Russia, a documentary series called 'Traitors'.

Critics of the Kremlin are frequently referred to as 'national traitors'.

Steve Rosenberg reports from Moscow.