Prime Minister Hun Sen is to depart Phnom Penh on Friday for Hua Hin, Thailand, leading the Cambodian delegation that will attend the 15th ASEAN summit through Sunday. Minister of Foreign Affairs Hor Namhong and Minister of Commerce Cham Prasidh will also be making the trip. Ministry of Foreign Affairs spokesman Koy Kuong was unsure whether Hun Sen will raise the ongoing border dispute between Cambodia and Thailand at the summit, saying Wednesday that the decision is up to the prime minister.