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".
Foreign policy of the Barack Obama administration
After the election of centrist moderate Hassan Rouhani as President in 2013, Iran started a new stage of dialogue in its foreign relations in a bid to improve relations with the west. At Rouhani's official visit to New York City to attend the United Nations General Assembly, Obama requested a bilateral meeting with Rouhani, which didn't take place due to time restraints according to Rouhani. Rouhani stated that more time was needed to organise a proper meeting between the two countries' leaders due to the troubled past relationship of the two nations. On 27 September 2013, Iranian Foreign Minister Mohammad Javad Zarif and Secretary of State John Kerry held a one-on-one meeting, the first between the U.S. and Iran in a generation. The rare get-together was groundbreaking, according to Iranian analysts. One day later, Obama and Rouhani spoke with each other on the phone, the highest level of communication between the two nations leaders since the Iranian Revolution of 1979.