The chief U.S. nuclear envoy arrived in Tokyo on Jan. 7 to coordinate policy in Asia following North Korea's failure to meet denuclearization promises, and repeated demands that the North fully declare its atomic programs and facilities.

"They have not provided a complete and correct declaration," Christopher Hill said after meeting with his Japanese counterpart, Kenichiro Sasae, at the Foreign Ministry in Tokyo, his first stop.

Referring to the North's obliged declaration of atomic programs and facilities, Hill said, "In those two areas, there are some omissions."

"The point is that when they submit a declaration, it must be complete and correct," he said. "We don't need a 90 percent declaration. We need a 100 percent declaration."

In its first statement on the nuclear issue since failing to meet a year-end deadline to declare its atomic programs, North Korea's Foreign Ministry on Jan. 4 accused the U.S. and other participants in the six-way disarmament talks of not carrying out their commitments.

It cited delays in shipping energy aid, and removing the North from U.S. terrorism and trade blacklists.

Sasae said he and Hill discussed "how to overcome the difficult situation" and that the two nuclear envoys "agreed to tackle the problems in order to continue pushing forward the denuclearization process."

North Korea last year promised to abandon its nuclear ambitions in return for the equivalent of 1 million tons of oil and political concessions.

In October, it pledged to disable its nuclear facilities and issue a declaration on its atomic programs by the end of 2007.