"In the United States, previous elections were falsified through postal voting ... they bought ballots for $10, filled them out, and threw them into mailboxes without any supervision from observers, and that's it," Putin said, without providing evidence. Putin's opponents say the March election in Russia is no real contest as the president wields unchallenged power and his main rival, Alexei Navalny, is serving more than 30 years in jail on charges that Navalny says were trumped up. They say the use of electronic voting creates scope for authorities to manipulate the vote in Putin's favour without detection.