However, the Vietnam intervention in Cambodia provided ASEAN a stimulant to bring its member together to articulate the ASEAN approach to security in Southeast Asia. The basic principles and approaches in security cooperation were developed; these included the ASEAN way (dialogues, consensus decision-making, non-interference, non-violent conflict resolution, quiet diplomacy informality, national resilience and regional resilience) and the Treaty of Amity and Cooperation in Southeast Asia (inviolability of national sovereignty, territorial integrity, peaceful settlement of disputes, non-intervention and mutual respect) The Cambodian conflict ended in 1991 by ASEAN performance.