Hearings in Russian oligarch Sergei Polonsky’s year-old assault case will resume at the Preah Sihanouk Provincial Court next month, even as the Court of Appeal prepares to make a formal decision about whether to extradite him to Moscow to face multimillion-dollar embezzlement charges there, a court official said Tuesday. In January, the Sihanoukville court charged Mr. Polonsky with assault following a dispute with Cambodian boatmen off the coast of Sihanoukville in December. The ex-billionaire spent three months in the provincial prison with two fellow Russians and was released on bail on April 3, although the indictment was not dropped.