Nuclear program of Iran
U.S. President Obama reportedly sent a letter dated 20 April 2010 to President Lula of Brazil, in which he outlined a proposal of fuel swap. While expressing skepticism that the Iranians would now be willing to accept such a deal, having provided "no credible explanation" for the previous deal's rejection, President Obama wrote "For us, Iran’s agreement to transfer 1,200 kg of Iran’s low enriched uranium (LEU) out of the country would build confidence and reduce regional tensions by substantially reducing Iran’s LEU stockpile." Turkish Prime Minister Recep Tayyip Erdogan received a similar letter. A senior U.S. official told the "Washington Post" that the letter was a response to Iran's desire to ship out its uranium piecemeal, rather than in a single batch, and that during "multiple conversations" U.S. officials made clear that Iran should also cease 20% enrichment; however, the official stated "there was no president-to-president letter laying out those broader concerns".
Nuclear program of Iran
In early August 2005, after the June election of Mahmoud Ahmadinejad as Iran's President, Iran removed seals on its uranium enrichment equipment in Isfahan, which UK officials termed a "breach of the Paris Agreement" though a case can be made that the EU violated the terms of the Paris Agreement by demanding that Iran abandon nuclear enrichment. Several days later, the EU-3 offered Iran a package in return for permanent cessation of enrichment. Reportedly, it included benefits in the political, trade and nuclear fields, as well as long-term supplies of nuclear materials and assurances of non-aggression by the EU (but not the US). Mohammad Saeedi, the deputy head of Iran's atomic energy organization rejected the offer, terming it "very insulting and humiliating" and other independent analysts characterized the EU offer as an "empty box". Iran's announcement that it would resume enrichment preceded the election of Iranian President Ahmadinejad by several months. The delay in restarting the program was to allow the IAEA to re-install monitoring equipment. The actual resumption of the program coincided with the election of President Mahmoud Ahmedinejad, and the appointment of Ali Larijani as the chief Iranian nuclear negotiator.