Meanwhile, China has built strong relationships across the region, in countries like Cambodia, which could divide Asean countries.
China says ASEAN is not the place to resolve these dispute because it is not about the regional forum.
Four ASEAN members - Brunei, Malaysia, the Philippines and Vietnam - claim overlapping parts of the South China Sea.
Regional tensions have risen recently, with Vietnam and the Philippines accusing China of aggressive behavior in the sea.
The meetings come amid rising tensions between ASEAN members and China over the South China Sea.
US Secretary of State Hillary Clinton’s trip to the Asean Regional Forum in Phnom Penh next week will mark her second visit to Cambodia.
Secretary of State Hillary Clinton is scheduled to attend an Asean security forum this month.
Cambodian health officials now say they are worried a decrease in aid funding to fight the disease could hurt their efforts to stop it.
The contentious issue of the South China Sea will also likely be on Clinton’s agenda, as she moves to further engagement in the region.
According to its recent report, there is an unprecedented demand for natural resources globally, but especially across Asia.
The two sides have been in a military standoff over a plot of land near the temple since July 2008.
A rights activist said Friday an investigation into the killing of environmental activist Chut Wutty in April had made some progress.