Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US Envoy in China to Discuss N Korea VOA News 23 November 2010 U.S. special envoy for North Korea Stephen Bosworth walks after arrival at Beijing airport, China, 23 Nov 2010 Photo: AP U.S. special envoy for North Korea Stephen Bosworth after his arrival at Beijing airport, China, 23 Nov 2010 American envoy Stephen Bosworth has arrived in China to discuss North Korea's latest nuclear escalation, but his hosts may not be happy with what they hear. A Chinese official said before his arrival that mounting tensions with North Korea make it "imperative" to restart six-party talks about Pyongyang's nuclear ambitions. But Bosworth told reporters earlier Tuesday in Tokyo that Washington is unwilling to resume the talks while North Korea has nuclear programs under way. Bosworth is traveling with seven other diplomats and intelligence officers to coordinate the policy response to Pyongyang's latest actions. Earlier this month, the secretive regime showed a top U.S. nuclear scientist a sophisticated uranium enrichment facility where it said it had 2,000 working centrifuges. Bosworth, the U.S. special envoy for North Korea, met officials in South Korea before traveling to Tokyo, where he and Japanese Foreign Minister Seiji Maehara agreed they should react calmly to the disclosure. Speaking briefly to reporters, Bosworth said it was "premature" to discuss U.S. terms for a resumption of six-party talks, which North Korea broke off last year. But, he said, "Clearly we do not contemplate resuming negotiations while active programs are underway or while there is a possibility that the North Koreans will test another nuclear device or test a missile." Senior U.S. military officials said Sunday that the uranium processing facility increased the threat that North Korea could make nuclear weapons to be used against its neighbors. But State Department spokesman P.J. Crowley said Monday the facility may be nothing more than a "publicity stunt." He said the glimpse of the facility given to American nuclear scientist Stephen Hecker does not necessarily mean that Pyongyang has mastered the technology.  Hecker said last week that he could not confirm that the complex was fully operational and that it may be intended to produce fuel for an experimental light-water reactor under construction nearby. But he said the facility also could be used to make highly enriched uranium for nuclear weapons. Bosworth has said the development of the facility violates a U.N. Security Council resolution and North Korea's own promises under a six-nation agreement in 2005. Some information for this report was provided by AP and Reuters. .