PARIS – Iran restarted important nuclear activities on the same day this week that six world powers offered it incentives aimed at encouraging the complete suspension of the nuclear work, the International Atomic Energy Agency reported on Thursday. On Tuesday, Iran restarted the pouring of a raw form of uranium into a set of 164 centrifuge machines to produce enriched uranium, said the nuclear monitoring agency based in Vienna, Austria. That same day, Javier Solana, the European Union’s foreign policy chief, was in Tehran, where he presented Iranian leaders with an international package of incentives to help resolve the crisis caused by the country’s nuclear program. There was no explanation for Iran’s decision. But it seemed to underscore its often-stated determination not to be bullied into accepting any deal requiring it to end activities related to uranium enrichment. AD Quality Auto 360p 720p 1080p Top articles1/5READ MORE11 theater productions to see in Southern California this week, Dec. 27-Jan. 2The decision also could be intended to win more concessions from the United States, Russia, China, France, Britain and Germany, which proposed the incentives package. The revelation seems likely to stiffen the resolve of the United States and the Europeans in particular that a complete freeze of uranium enrichment and reprocessing activities is a condition for talks. In April, Iran succeeded in enriching uranium to the low levels needed to fuel a nuclear reactor. Later that month, without explanation, it stopped introducing the raw form of uranium into the fast-spinning centrifuge machines that concentrate uranium into material that can fuel nuclear reactors or bombs. The empty machines continued to run, which is necessary to prevent them from wobbling. In his first public comments since Iran was presented with the incentives package, President Mahmoud Ahmadinejad said Thursday that Iran was willing to restart negotiations to resolve misunderstandings, but would never give up its “rights,” code for what Iran has consistently said is its sovereign right to enrich uranium for peaceful purposes under the Nuclear Non-Proliferation Treaty. “On behalf of the Iranian nation, I’m announcing that the Iranian nation will never hold negotiations about its inalienable rights with anybody, but we are for talks about mutual concerns to resolve misunderstandings in the international arena,” he told a crowd of thousands in the city of Qazvin. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set!