A Volkswagen AG compliance executive arrested in the U.S. over the company's emissions-cheating scandal pleaded not guilty to charges of fraud and conspiracy as five others remain outside prosecutors' reach. Oliver Schmidt, a German national, was arrested last month in the U.S. while on vacation in Florida. The five other executives based in Germany, also indicted by the U.S. for their alleged roles in the scheme, have stayed home where they are protected from extradition.