Vice president of Cambodia’s National Assembly, Nguon Nhel, says Cambodia should not be compared to Middle Eastern dictatorships.
The petition comes just a week before ministers of Mekong River Commission member states, are to meet to make a final decision.
Cambodian efforts more than a decade ago helped lead the way for the Ottawa Treaty, which later won the Nobel Peace Prize.
Cambodia is hosting the 11th gathering of 158 state parties who signed an international landmine ban in 1997.
The agreement was made public after a meeting between Council Minister Sok An and a former ambassador from Pyongyang, last week.
At least two women threatened suicide over the loss of their homes.
Drugs such as crystal meth and ecstasy are now among the top three drugs of use in the 15 east and southeast Asian countries.
It took the prosecution one and a half days to put its argument against the Khmer Rouge leaders to the court.
Landmines have killed an estimated 1 million people in the last 10 years.
Cambodia’s press freedoms were ranked 128th out of 178 countries in 2010, a slide from 117th the year before.
The rights group says the Cambodian government is ignoring its international obligations by pushing ahead with forced evictions.
In the past, Nuon Chea and Ieng Sary’s defense officials have requested the former king be summoned, to no avail.