After the Fall of Nations, the September 1990 Sino-Vietnamese Chengdu Conference [vi] favored the Beijing-proposed 13 members dialogue[2] instead of the Hanoi-proposed 12 members dialogue solution[3]. Following discussions in Indonesia and Japan in October 1990, the parties agreed a plan in which they would be guided by certain principles in order to solve the Cambodian problem.[3] The Security Council, in Resolution 668, acknowledged and welcomed the agreement.