President Obama put his arm around Burma's opposition leader Aung San Suu Kyi on the latest stop in his tour of South East Asia.
He also met the country's president Thein Sein - the man who has begun gradually embracing reform.
Speaking at the home where Ms. Suu Kyi spent years under house arrest, Mr Obama said something was happening in the country that could not be reversed.
ITV News' International Editor Bill Neely reports:
US President Barack Obama has spent the day in Thailand at the start of a three-day tour of Southeast Asia.
Barack Obama is touring Southeast Asia to showcase foreign policy achievement and reinforce the U.S. role as a counterweight to China.