Timeline of Iran's Nuclear Activities
Dec. 18 – Tehran signed the Additional Protocol to the Non-Proliferation Treaty’s Safeguards Agreement. The Additional Protocol granted IAEA inspectors greater authority in their nuclear verification programs. Since then, Iran has at times voluntarily allowed more intrusive inspections, but the Iranian parliament has not yet ratified the Additional Protocol.
Aug. 11 –The IAEA urged Iran to suspend all enrichment activities and re-instate IAEA seals.
Nov. 24 – Iran and the P5+1 reached an interim agreement that would significantly constrain Tehran’s nuclear program for six months in exchange for modest sanctions relief. Iran pledged to neutralize its stockpile of near-20 percent enriched uranium, halt enrichment above five percent and stop installing centrifuges. Tehran also committed to halt construction of the Arak heavy water reactor.
May 13-16 – The P5+1 and Iran met in Vienna to begin drafting a final agreement. The talks ended without any tangible progress. But both sides committed to another round of talks in June.
Oct. 14-16 – The P5+1 and Iran met in Vienna and made a little progress. Disagreements remained over Tehran’s uranium enrichment capabilities and a timeline for implementing a deal. Officials emphasized that the sides had not given up on the November 24 due-date for a deal and that the talks had focused on a “full agreement,” not just understandings of key issues.
Nov. 9-11 – Kerry, Zarif, and Ashton met for two days of trilateral talks in Oman, followed by a day of meetings between Iran and the full P5+1. The removal of sanctions and levels of uranium enrichment were among the issues on the table, but officials did not report any significant progress from this round of discussions.
Nov. 19-21 – The final round of talks began in Vienna. On November 19, Zarif and Ashton held a meeting, and the U.S. and Iranian teams held bilateral talks. Kerry arrived in Vienna on November 20 after meeting with Omani Foreign Minister Yusuf bin Alawi in London and French Foreign Minister Laurent Fabius in Paris. Kerry, Ashton, and Zarif held another round of discussions on November 21, but Zarif noted that he had received "no remarkable proposals to take to Tehran" after the meeting.
March 26-April 2 – Iran and the P5+1 met in Lausanne, Switzerland in the final days before the deadline for a political framework. Kerry and Zarif held bilaterial discussions, and negotiators from Britain, China, France, Russia, and Germany joined the talks on March 28.
July 14 – Foreign ministers from Iran and the P5+1 announced they had reached a final nuclear agreement.
July 20 – The U.N. Security Council unanimously adopted resolution 2231 endorsing the final deal. The deal and its annexes were also delivered to the U.S. Congress, beginning a 60-day review period.
Garrett Nada and Cameron Glenn also contributed to this timeline.
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