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".
Mohammad Javad Zarif
He welcomed the first visit by a foreign leader to Iran since Rouhani assumed the presidency ten days after his approval as Foreign Minister with the arrival of Oman's sultan, Qaboos bin Said Al Said. Stories spread that there was a secret agenda to his meetings with Iranian officials, involving claims that he came to convey messages from the United States and then to relay Iran's response to White House officials. On 5 September 2013, in an exchange prompted by his Rosh Hashanah greeting on Twitter, Zarif said that Iran does not deny the Holocaust, distancing the government from the often belligerent stances by former President Mahmoud Ahmadinejad. Genuineness of Zarif's tweeting in English was confirmed by CNN's Christiane Amanpour. On 27 September 2013, he met with U.S. Secretary of State John Kerry during P5+1 and Iran summit. It was the highest-level direct contact between the United States and Iran in the last six years. After the meeting, Kerry said that "We had a constructive meeting, and I think all of us were pleased that Foreign Minister Zarif came and made a presentation to us, which was very different in tone and very different in the vision that he held out with respect to possibilities of the future."