The United States remains willing to remove North Korea from a list of terror-sponsoring states as soon as the North agrees rules to check its nuclear disclosures, reuters quoted Washington's envoy in disarmament talks as saying on Saturday. U.S. Assistant Secretary of State Christopher Hill made the comments ahead of talks in Beijing aimed at shoring up steps to dismantle North Korea's nuclear weapons programme in return for aid and diplomatic concessions. Envoys from Japan and South Korea have also gathered in Beijing for the latest talks. But top North Korea envoy Kim Kye-gwan did not appear at Beijing International Airport and failed to show up for the talks in Beijing, Yonhap news reported. "It was already expected that Deputy Foreign Minister Kim would not visit China," an unidentified South Korean diplomatic source was quoted as saying. "It appears that Kim has concluded that he would gain little from the negotiations, with his country having turned hard-line already." North Korea started to disable its Yongbyon nuclear facility in November, but halted that last month, angered that Washington has yet to drop it from the U.S. list of state sponsors of terrorism. But Hill said Pyongyang had to agree first on rules allowing inspectors to verify the declaration on its nuclear inventory submitted in June. "I think obviously we need to get from the North Koreans the means by which we're going to verify the declaration," Hill told reporters before heading for discussions with China's envoy in the six-party nuclear talks, Wu Dawei. "Then we'll be prepared immediately to delist them from the terrorism list, which was our agreement." The terror list is one of a series of sanctions isolating Pyongyang economically and diplomatically. North Korea has publicly exaggerated the intrusiveness of the verification proposed by other countries in the talks, Hill said. "I know that the North Koreans have expressed concerns that we're looking at house-to-house searches. No one is talking about house-to-house searches," he said. Since 2003, China has sponsored the stop-start disarmament negotiations with North Korea, which also include the United States, South Korea, Japan and Russia. Seoul's representative in the talks, Kim Sook, said on Friday that efforts to defang North Korea's nuclear weapons ambitions had reached a "critical moment". But without Pyongyang at the latest talks, a breakthrough over the weekend appears unlikely. Hill said on Friday he would be willing to meet North Korean officials while in Beijing, but said no such meeting was planned.