So much for all the talk of a Moscow Spring. Despite sporadic street protests and the stirrings of middle-class rebellion, Vladimir Putin is back in the Kremlin and Russia's economic and political status quo remains intact. Why do liberal opponents of Putin struggle to gain traction? Stephen Sackur speaks to Grigory Yavlinsky, economist, reformer and a veteran leader of Russia's fragmented opposition. Will the liberals ever win in Russia?