US adopts tough stand ahead of nuclear talks with North KoreaFri Sep 9, 7:22 PM ET The United States adopted a tough stand ahead of talks aimed at ending North Korea's nuclear weapons program, saying it would not compromise on the hardline communist state's request to maintain peaceful atomic activities. "Our opposition has been very clear on this. What North Korea has to do is get out of the nuclear business," said Christopher Hill, the chief US negotiator to the six-party talks due to resume in Beijing on Tuesday. "Nuclear weapons, nuclear programs are not something that one should leave...