It's been called the greatest art feud of modern times - a dispute that pits Russian billionaire and collector Dmitry Rybolovlev against the Swiss art dealer and businessman Yves Bouvier. In a fresh twist, Mr Rybolovlev has handed over two paintings by Pablo Picasso to the police. James Pickford talks to the FT's Cynthia O'Murchu and arts writer Georgina Adam about the feud. For information regarding your data privacy, visit acast.com/privacy