The Russian Revolution a hundred years on. To mark the centenary Tom Sutcliffe is in Moscow to discuss the forces that led to the Revolution, and to find out how far Russians today embrace or reject such a pivotal moment in their country's history. He talks to a senior member of President Putin's political party, Konstantin Kosachev. And he is joined by the journalists Mikhail Zygar and Arkady Ostrovsky and the Director of the Tretyakov Gallery, Zelfira Tregulova.