World leaders are gathering for wide-ranging talks in Myanmar in the country’s biggest event since it emerged from military rule.
Heads of Asian nations are expected to discuss territorial disputes in the South China Sea and the rise of Islamic State in the Middle East.
It comes as Myanmar’s own democratic reform process is called into question.
US President Barack Obama is attending and will meet both President Thein Sein and opposition leader Aung San Suu Kyi.
The summit for the Association of Southeast Asian Nations (Asean), which has 10 member states, began on Wednesday in the capital, Nay Pyi Taw.
Several member nations, including the Philippines and Vietnam, are currently embroiled in territory disputes with China over islands in the South China Sea.