An activist wears a devil’s mask which he covers with a picture of Vladimir Putin as part of a protest against the Russian President outside the congress center of the Hanover trade fair on April 7, 2013 in Hanover, western Germany. Putin arrived for the official opening of the industrial trade fair with German Chancellor Angela Merkel (not in pic). Activists and critics said Putin should be held to account for a recent crackdown on non-governmental organisations promoting democratic reforms in Russia. AFP PHOTO / ODD ANDERSEN