Ahmadinejad sworn in as Iran's president
Mahmoud Ahmadinejad has been sworn in as Iranian president as riot police broke up an opposition protest over an election that triggered the worst turmoil in the Islamic republic's history.
Russian President Dmitry Medvedev, right, welcomes Iranian President Mahmoud Ahmadinejad, who has arrived in Russia to attend a regional security summit in Yekaterinburg, Russia.