US Chief negotiator Christopher Hill said here Thursday parties to the ongoing nuclear talks need to clarify the principles for the denuclearization of the Korean Peninsula.

Hill told reporters Thursday morning "we really need clarity on the principles, it is precisely the clarity that we are seeking. That is so necessary."

"Everyone in Washington very much wants to see we reach an agreement, an agreement on principles, so that we can move on," he said.

He said he needed to know precisely what the delegation of the Democratic People's Republic of Korea (DPRK) has agreed to do.

Hill said he would meet the Chinese delegation and possibly confer with the other delegations Thursday morning.

He also appreciated China's efforts on the draft.

As the end date has not yet been decided when the six-party talks have entered the tenth day, Hill said he would stay "as long as I feel it is useful to be here."

Japanese delegation head Sasae Kenichiro said Thursday his delegation would hold talks with the Chinese delegation Thursday morning.