Diplomats say a move to neutral camps now would only benefit the Vietnamese-installed Government in Phnom Penh.
More than 275,000 refugees have returned, mostly to areas under the control of the Vietnamese-installed Cambodian Government.
It was the first significant release of prisoners in years by the Vietnamese-installed Government.
The agreement also formalized the truce declared on Sunday between the Vietnamese-installed Government and the three guerrilla groups that have been fighting to overthrow it.
The coalition's goal was the ouster of the Vietnamese-installed Government in Phnom Penh.
And whether he is using them as a lever against the Vietnamese-installed Government, or being used himself by crafty forces, he remains allied with them still.
Prince Sihanouk's restoration as chief of state stemmed from a 1991 peace accord between three rebel factions and the Vietnamese-installed Government.
The correspondent is less tough when talking about the Vietnamese-installed Government in Phnom Penh.
Cambodian rebels have been fighting the Vietnamese-installed Government for nine years.
The Bush Administration, which does not recognize his Vietnamese-installed Government, is extending a cautious welcome.