Cambodian Prime Minister Samdech Techo Hun Sen (C) attends the 22nd ASEAN Plus Three Summit in Bangkok, Thailand, Nov. 4, 2019. The Association of Southeast Asian Nations, China, Japan and South Korea (ASEAN Plus Three countries or 10+3) pledged here Monday to enhance regional connectivity to realize their collective efforts for regional integration and promote sustainable development. (Xinhua/Zhu Wei)