Russian opposition leaders Garry Kasparov (R) and Eduard Limonov attend a news briefing in central St.Petersburg March 3, 2008. Russia's next president, Dmitry Medvedev, vows to uphold his mentor Vladimir Putin's policies after winning an election criticised by Western observers as not fully democratic. Russian opposition leaders complained of violations in the conduct of Sunday's presidential election. REUTERS/Alexander Demianchuk (RUSSIA)