Human Rights Party President Kem Sokha has asked King Norodom Sihamoni to consider intervening in the ongoing border crisis at Preah Vihear temple.

"We believe that only Your Majesty can solve the issue, because the royal families of the two countries have a good relationship, and have no political interests or partisanship," Kem Sokha wrote in a letter to Sihamoni.

Kem Sokha sent the letter following failed bilateral negotiations Monday and an impending UN Security Council meeting over a situation Cambodia has called "an imminent state of war."

Royal spokesman Oum Daravuth declined to comment on the letter, but said "we all" should join the government to solve the issue of sovereignty, not political gain.