SINGAPORE, Nov. 13 (Xinhua) -- The 33rd summit of the Association of Southeast Asian Nations (ASEAN) opened here Tuesday with a call for upholding multilateralism and international cooperation.

The summit, gathering leaders of ASEAN's 10 member countries, will review ASEAN's achievements in the year 2018 in pushing forward the bloc's community building and integration while mapping out a new course for the year ahead.

In a speech at the opening ceremony of the summit, Singaporean Prime Minister Lee Hsien Loong called on ASEAN members to uphold multilateralism and international cooperation in future development and tackling common challenges including terrorism and climate change.

Established in 1967, ASEAN groups Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Vietnam.