Kerry Heading for Iran Nuclear Talks Secretary of State John Kerry is heading to Geneva to join negotiations about Iran's nuclear program, the State Department announced Friday, raising expectations that a deal to curb Tehran's nuclear program could be in the works. State Department spokeswoman Jen Psaki said Kerry would arrive early Saturday, joining Russian Foreign Minister Sergey Lavrov. They will lend weight to negotiations aimed at beginning a rollback of Iran's nuclear program in exchange for easing U.S. and international sanctions. Negotiators have been working since Wednesday to find language acceptable to Iran and its six negotiating partners - the U.S., Russia, China, France, Britain and Germany. As negotiations moved into the evening, a diplomat in Geneva for the talks said some progress was being made on a key sticking point - Iran's claim to a right to produce nuclear fuel. Iranian Foreign Minister Mohammad Javad Zarif and Catherine Ashton, the European Union's top diplomat, have met repeatedly since Wednesday trying to resolve that and other differences. The last round of talks between Iran and the six world powers ended Nov. 10 with no deal even after Kerry, Lavrov, the foreign ministers of Britain, France and Germany and a Chinese deputy foreign minister flew in and attempted to bridge differences. Zarif and Ashton met briefly Friday for talks that Iran's official IRNA news agency described as "complicated and tough." It quoted Iranian Deputy Foreign Minister Abbas Araghchi in Geneva as saying that Iran's right to uranium enrichment must be part of any deal. Iran says it is enriching only for reactor fuel, medical uses and research. But the technology can also produce nuclear warhead material. Zarif last weekend indicated that Iran is ready to sign a deal that does not expressly state Iran's right to enrich, raising hopes that a deal could be sealed at the current Geneva round. On Wednesday, however, Iran's supreme leader, Ayatollah Ali Khamenei, said his country would never compromise on "red lines." Since then Tehran has reverted to its original line - that the six powers must recognize this activity as Iran's right under the nuclear Nonproliferation Treaty despite strong opposition by Israel and within the U.S. Congress. A senior Iranian negotiator said that the Iranian claim did not need to be explicitly recognized in any initial deal, despite Khamenei's comment. He did suggest, however, that language on that point remained contentious, along with other differences. The diplomat said work was proceeding on a compromise along the lines of what the Iranian negotiator said - avoiding a direct reference to any country's right to enrich but still giving enough leeway for Iran to accept it. Both he and the Iranian envoy demanded anonymity because they were not allowed to discuss the closed negotiations. The United States and its allies have signaled they are ready to ease some sanctions in return for a first-step deal that starts to put limits on Iran's nuclear program.