state, a leading Russian opposition politician told Express.co.uk. He also said the only way to remove the Russian President and his "criminal" regime was through the use of force. Andrey Sidelnikov has an extensive background in Russian politics, having initially acted as one of the leaders for Boris Berezovsky's Liberal Party, before going on to help found the Union of Right Forces in 1999 and whose backers included Boris Nemstov and Yegor Gaidar.