Putin sworn in as riot police clash with protesters
Russia Protest
Russian riot police officers detain protestors during an opposition rally in the center of Moscow during a rally, in Moscow, Russia, Sunday, May 6, 2012. A protest demonstration by at least 20,000 people on the eve of Vladimir Putin's inauguration as president boiled into a battle with police after protesters tried to split off from the approved venue and march to the Kremlin.(AP Photo/Alexander Zemlianichenko Jr)