Sam Rainsy says the influences of the US and China on Cambodia are positive in contribution.
The leaders of Burma, Cambodia, Laos and Vietnam met in Phnom Penh on Tuesday, vowing closer ties for economic growth.
Chea Vichea, a widely popular labor leader, was shot to death in February 2004.
Around 60,000 Thai tourists have visited Cambodia in the first nine months of 2010, a drop of 9 percent from the same period last year.
The 93-minute film has won 16 awards in the US and other foreign countries, including the Special Jury Prize at Sundance.
Suu Kyi was released on Saturday, imprisoned or under house arrest for most of the last 20 years.
Analysts have said such a move could draw the ire of China, which sees India as a growing regional rival.
Cambodia to send more than 200 deminers as UN peacekeepers to Lebanon.
On a scale between one and 100, Cambodia ranks 15 this year, up from 11 in 2009.
Some were upset by the lack of provisions within Asean and its commission on key rights freedoms.