In a letter dated 19 February 2010, Iran informed the IAEA that it was continuing to try to purchase URE for Tehran`s research reactor on the international market and that it was prepared to exchange EEUs for fuel assemblies „simultaneously or as a whole within Iranian territory“. Iran has asked the IAEA to convey this message to the P5-1, but the parties have not been able to resume negotiations.  The interruption of the talks was followed by a new proposal for the exchange of nuclear fuel, which was presented by Brazil and Turkey. On 17 May 2010, Brazil, Turkey and Iran made a joint declaration in which Iran agreed to export half of its stockpile of URE (1200 kg) to Turkey as a confidence measure, in exchange for 120 kg of 20% enriched uranium for use in its medical research reactor.  However, the agreement was not accepted by Western countries, which felt that Iran`s agreement to withdraw only 1200 kg of URE from its territory was insufficient, too late. In early 2019, President Trump ordered the assassination of General Qasem Soleimani, who was one of Iran`s military leaders. In response, Iran announced that it would no longer abide by the nuclear agreement signed by President Obama in 2015. According to a televised press report based on the Joint Comprehensive Action Plan (JCPOA), Iran`s additional centrifuges and related infrastructure at the Natanz plant are being assembled by the International Atomic Energy Agency (IAEA) to be replaced by new machines that meet permitted standards. Iran is authorized to allocate current stocks of enriched materials for the production of nuclear fuel or the exchange of uranium on international markets. These comprehensive solutions allow Iran to continue its enrichment program on its territory and has also allowed it to continue producing nuclear fuel for the operation of its nuclear power plants.  On May 8, 2018, President Trump announced that the United States would stop implementing the JCPOA and begin reintroducing nuclear sanctions against Iran.
 He said the agreement was „fundamentally flawed,“ citing Iran`s support for terrorism and the pursuit of ballistic missiles, as well as revelations by Israeli intelligence about Iran`s previous nuclear ambitions to justify the US withdrawal. He did not report any concrete violations of the JCPOA by Iran.  Following the government`s decision, U.S. companies with trade relations with Iran must split contracts within 180 days, and the U.S. Treasury will again impose secondary sanctions on the Central Bank of Iran.  Iranian President Hassan Rouhani said that Iran intends to explore options for maintaining the agreement with the P5-1 countries. However, he expressed his displeasure at the lack of U.S. commitment to the agreement and also announced that he had asked „the [Iran`s] Atomic Energy Organization to prepare the necessary orders to begin unlimited enrichment.“  The Heads of State and Government of France, the United Kingdom and Germany issued a joint statement on behalf of their countries reaffirming their support for the agreement and its importance to the non-proliferation regime.  UN Secretary-General Antonio Guterres said he was „deeply concerned“ by Trump`s decision and issued a statement of support for the continued implementation of the JCPOA.