President Medvedev holds formal power, but the prime minister who hand-picked Mr Medvedev to succeed him, former president Vladimir Putin, still has enormous influence. On the eve of his visit, Mr Obama appeared to give his backing to Mr Medvedev. In an interview with Russian opposition newspaper Novaya Gazeta, he supported the president's promises to boost freedom and the rule of law. It seemed to be part of a move to signal support for Mr Medvedev over the more conservative Mr Putin.