The UN may be pushing for more funding at the tribunal, which has struggled financially all year.
The exploitation of resources, including for hydropower, have increased the burdens on some villagers.
The EU's local representative said in September his office was looking into the reports.
As a result of the charges, Sam Rainsy has been stripped of his parliamentary immunity.
The Anti-Corruption Unit have been criticized as toothless to attack the pervasive corruption across the government.
The Appeals Court said Wednesday that the two villagers could be released with time served.
Cambodia's workers say they have come under increased pressure from a rising cost of living.
Ros Sokhet, was sentenced to two years in prison after he sent text messages to a famous news anchor that were deemed threatening.