The three-day event marks the first appearance of a Myanmar junta representative since the 2021 military coup, highlighting the ongoing crisis as a key discussion point.
Thai Prime Minister Paetongtarn Shinawatra urged for a unified message against military solutions in Myanmar, while hinting at support for elections under the junta's supervision.
South China Sea territorial disputes also feature prominently on the agenda, with leaders from the Philippines and Vietnam expected to address the issue.
Chinese Premier Li Qiang is set to attend related meetings, presenting Beijing's stance on the matter. U.S. Secretary of State Antony Blinken, representing President Joe Biden, plans to emphasize international law compliance in the South China Sea and discuss geopolitical concerns such as Russia's invasion of Ukraine and North Korea-Russia cooperation.
The summit will host various multilateral meetings, including ASEAN+3 and the East Asia Summit.