The spokesman for the Islamic Republic of Iran’s foreign ministry, Abbas Mousavi, revealed the details of Foreign Minister Javad Zarif’s letter to Federica Mogherini, the High Representative of the EU for Foreign Affairs, in which Zarif informs her that the Islamic Republic has ceased all its commitments in JCPOA in the field of nuclear research and development as of Thursday.

“due to consequences of the US withdrawal from JCPOA and re-imposition of sanctions against it as well as three European states' inability to fulfill their commitments under the deal and statements of the joint commission, Iran ceases all its commitments in JCPOA in the field of nuclear research and development as of today (Thursday),” says the letter according to Mousavi.

"The letter has reiterated that the move was taken just exactly in line with Iran's rights under the JCPOA, especially Clause 36 and in response to extensive and regular violation of the deal over the past 16 months and technical and operational details of stopping Iran's commitments in the field of research and development will be communicated to the IAEA subsequently," Mousavi added.

 The letter concludes: “The Islamic Republic of Iran is ready of talks with the remaining parties in JCPOA to show its goodwill and return to the deal as soon as the other parties do their part under the accord.”

On Wednesday, September 4, President Rouhani officially announced that the third step in scaling down compliance with commitments to the nuclear deal known as the Joint Comprehensive Plan of Action (JCPOA) will begin on Friday, September 6.

Rouhani said that the third step will include the use of a new generation of centrifuges that were restricted under the nuclear deal, and “lifting all the restrictions on research and development.”

President Rouhani issued another 60-day ultimatum for the European countries to meet Iran’s demands and comply with their commitments to the nuclear deal, saying: “Whenever they return to compliance with their commitments to the JCPOA, we will return to our commitments.”