Indonesian President Joko Widodo 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. (Photos: Xinhua)

Brunei Sultan Haji Hassanal Bolkiah 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.

Thai Prime Minister Prayut Chan-o-cha speaks at 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.

Malaysian Prime Minister Mahathir Mohamad (front) 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.

Vietnamese Prime Minister Nguyen Xuan Phuc 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.

Singaporean Prime Minister Lee Hsien Loong 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.

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.

Japanese Prime Minister Shinzo Abe (C), South Korean President Moon Jae-in (R) and Singaporean Prime Minister Lee Hsien Loong attend 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.

Myanmar State Counselor Aung San Suu Kyi 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.