US has no problem with the Bushehr nuclear reactor, where Iran is loading fuel into it, but said it is concerned about the atomic weapon ambition of the Mahmoud Ahmadinejad regime, a top Obama official said."This reactor is monitored by the IAEA with cooperation from Russia. We have monitoring in place... and we believe Iran has the right to produce peaceful nuclear power," White House Press Secretary Robert Gibbs told reporters at his daily news conference."That does not let it get out of its responsibilities in international agreements and commitments to step away from an illicit nuclear weapons programme. So I would definitely divorce the two things," Gibbs said.The spokesman, however, refuted reports that the sanctions on Iran are not working.