The World Cup final was interrupted on Sunday by four pitch invaders dressed in suits, in a concerted action claimed by Pussy Riot. The intruders entered the field at the Luzhniki Stadium in Moscow, causing a brief stoppage in the game between France and Croatia in the 52nd minute. The quartet were allowed to high-five members of the French team before being accosted and unceremoniously dragged off the playing surface. Russian protest group Pussy Riot quickly claimed responsibility in a tweet which read: "Right now, there are four members of the band in the World Cup final." The punk rock...