A police officer carries a tent which was set up by opposition leader Yevgeniya Chirikova, unseen, during a protest at the Red Square in Moscow, Sunday, April 8, 2012. Police arrested prominent opposition leader along with several other activists when they tried to put up a small tent on the Red Square. Opposition activists called for supporters to walk around Red Square on Sunday wearing the white ribbons that have become a symbol of the protest movement against Prime Minister Vladimir Putin. Putin will begin serving a third presidential term in May. (AP Photo/Maria Turchenkova)