Barack Obama has begun a tour of South East Asia, which will include a historic visit to Myanmar.
Obama landed in Thailand's capital Bangkok on his first foreign trip after his re-election as president.
On Monday he will become the first US president to visit Burma, which has been praised in the West for freeing hundreds of political prisoners and holding its first contested election.
Obama has been trying to refocus US foreign policy towards Asia.
Analysts say the US is trying to counter the dominating influence of China in the region.