In the past five years China and Cambodia have drawn ever closer, with Beijing investing billions of dollars in the country.
Kampong Speu court released two men on bail Monday, following a week of turbulent protests on their behalf.
Hor Namhong has said he was a victim within the Boeung Trabek camp, where several inmates died.
Hundreds of villagers stopped traffic on National Route 4 Friday as they continued a sustained demonstration in a land dispute.
Opposition leader Sam Rainsy, who is accused of putting a false map of the Vietnamese border on his party’s Web site.
Thai Prime Minister Abhisit Vejjajiva, Hun Sen and other leaders will meet at the first Mekong River Commission summit early next month.
Thai protesters have gathered in the tens of thousands in Bangkok to demand fresh elections.
More than 200 villagers gathered in front of the Kampong Speu provincial court Thursday, demanding the release of five representatives.
A senior Thai Asean official has expressed regret for commenting on a rocket-launch exercise undertaken by Cambodia last week.
Prime Minister Hun Sen lashed out a senior Thai Asean official on Monday for remarks critical of Cambodia’s military rocket exercise.