In a major development, the eldest son of Cambodia’s long-term ruler Hun Manet has been appointed as the country’s next Prime Minister in a formality confirming the transition of power. This came nearly two weeks after Sen stepped down as the world’s longest-serving leader, he issued a decree stating Hun Manet will succeed Hun Sen.In a major development, the eldest son of Cambodia’s long-term ruler Hun Manet has been appointed as the country’s next Prime Minister in a formality confirming the transition of power. This came nearly two weeks after Sen stepped down as the world’s longest-serving leader, he issued a decree stating Hun Manet will succeed Hun Sen.