Roy Disney resigned as vice-chairman of the Walt Disney entertainment group on Sunday and called for Michael Eisner, chairman and chief executive, to follow suit, bringing to a head a conflict that has been brewing for a decade. "It is my sincere belief that it is you who should be leaving and not me," he said in a bitter letter that criticised Mr Eisner's performance and style on seven counts. The departure and open hostility of Mr Disney, nephew of Walt Disney and still a substantial shareholder, are likely to reignite the debate about the media company's direction. It marks...