Academic fled Cambodia for Australia. He now admits he was on Hun Sen's payroll / Hun Sen Adviser Wanted in Thailand Over Lim Kimya Killing / Cambodia: Ex-dictator Hun Sen returns as chief of Senate / Hun Sen becomes Cambodia's Senate president, allowing him to act as head of state when king is overseas / Cambodia's ruling party wins Senate election, paving the way for Hun Sen to act as its president / Cambodia election sweep cements Hun Sen family's grip on power / Senate election held in Cambodia, ex-PM Hun Sen seen to get top post