KOH DEK KUOL, Preah Sihanouk Province – Three days after Interpol requested his extradition to Russia to face multimillion–dollar embezzlement charges there, Sergei Polonsky decided to go on a picnic. “Five minutes, we go,” the 41-year-old Russian ex-billionaire announced Thursday to his staff on Koh Dek Kuol, his tiny private island just a 30-minute boat ride from the coast of Sihanoukville, prompting a flurry of activity and walkie-talkie chatter.*