On 14 January 1985, Hun Sen was appointed Prime Minister of the People's Republic of Kampuchea and began peace talks with the factions of the Coalition Government of Democratic Kampuchea. Between 2–4 December 1987, Hun Sen met with Sihanouk at Fère-en-Tardenois in France to discuss the future of Kampuchea. Further talks occurred between 20–21 January 1988, and Hun Sen offered Sihanouk a position within the Kampuchean Government on the condition that he returned to Kampuchea straight away. However, Sihanouk did not accept the offer, even as preparations were made in Phnom Penh to receive him. Despite that failure, Hun Sen's Kampuchean Government was able to persuade Cheng Heng and In Tam, both ministers in Lon Nol's government, to return to Kampuchea. In the first major step towards restoring peace in Kampuchea, representatives of the CGDK and the PRK met for the first time at the First Jakarta Informal Meeting on 25 July 1988. In that meeting, Sihanouk proposed a three-stage plan, which called for a cease-fire, a UN peacekeeping force to supervise the withdrawal of Vietnamese troops and the integration of all Kampuchean armed factions into a single army.