Protests are taking place in Moscow and other cities . Demonstrators think the parliamentary vote was rigged . Vladimir Putin 's United Russia retained its majority . 20,000 to 25,000 people turned out for protest in Russia , they say .
Protests are taking place in Moscow and other cities . Demonstrators think the parliamentary vote was rigged . Vladimir Putin 's United Russia retained its majority . 20,000 to 25,000 people turn out for protest in Russia , police say .