Iran Unveils Uranium Sites, Renews Defiant Tone With words of defiance, Iran announced two nuclear-related projects Tuesday that expand capabilities to extract and process uranium - modest advances in Tehran's atomic efforts but ones symbolic of its refusal to slow nuclear work even as talks with world powers over the disputed program remain deadlocked. The twin sites reflect Tehran's goal of greater self-sufficiency through the entire nuclear fuel cycle from uranium mines to enrichment labs. Yet the timing - just days after the latest round of negotiations ended again in stalemate - reinforces a broader suggestion that Iran plans to push ahead with nuclear projects even at the potential risk of threatening the dialogue with U.S. and other envoys. It also could amplify questions about Iran's commitment to the talks - which have, for the moment, hushed earlier talk among its adversaries about military options - and embolden calls by some U.S. lawmakers for even tougher sanctions. Iran's gambit appears built around its drive for formal acknowledgment from Washington and other capitals of its "right" to enrich uranium, the process to make nuclear fuel. Iran, in tandem, wants the West to pull back on sanctions in exchange for some nuclear compromises. The West and its allies, however, seek to rein in Iran's nuclear efforts and fear that the enrichment program could one day produce material for atomic weapons. Iran says it only seeks nuclear reactors for energy and medical use. But the tone from Iranian President Mahmoud Ahmadinejad was taunting on Tuesday to mark the anniversary of Iran's first uranium enrichment in 2006. You could not block our access to nuclear technology when we didn't have it. How can you take it from our hands now that we have it?" he said, addressing the West. "Iran has gone nuclear," he added, reiterating past declarations that Iran has comprehensive nuclear expertise. Nobody will be able to stop it ... Cooperation with the Iranian nation is the best solution for you. In Jerusalem, U.S. Secretary of State John Kerry repeated that Washington remained "open to negotiation" within limits. He later called the expanded uranium work "not constructive." "But it is not open-ended, endless negotiation," he said following talks with Israeli Prime Minister Benjamin Netanyahu, whose nation has warned it could consider military strikes against Iranian nuclear sites. It cannot be used as an excuse for other effort to try to break out with respect to a nuclear weapon. Kerry added: "President (Barack) Obama could not be more clear: Iran cannot have and will not have a nuclear weapon." Mounting nuclear threats from North Korea, meanwhile, have only added to international worries about allowing the Iranian dialogue to drift indefinitely. "I think everybody understands that Iran is running out the clock, has been using the talks to continue to advance its nuclear programs," Netanyahu said, citing the reports of two new uranium sites in Iran. Neither represents breakout technology. Iran already has uranium mines and the ability to turn the raw ore into a material called yellowcake, which is the first step in the enrichment chain. But the new facilities - expansion in the country's largest uranium mine and processing facility - give Tehran greater access and control in making the raw materials for enrichment to nuclear fuel and, potentially, for warhead-grade material.