Malaysia's disgraced ex-leader Najib Razak pleaded not guilty to all charges against him as he went on trial Wednesday over a multi-billion-dollar fraud, almost a year after his shock election loss.The 65-year-old faced the first of several trials over his alleged involvement in the looting of sovereign wealth fund 1MDB, a state investment vehicle established to develop the economy of the Southeast Asian nation.The former premier and his cronies are accused of plundering billions of doll