A day after US Secretary of State Anthony Blinken confirmed that Iran's latest response to the revival of the nuclear deal was a step "Back to back," he added, "We are not about

to agree to an agreement that does not meet our basic requirements." France, Germany and Britain expressed in a joint statement "Serious doubts" about Iran's sincerity in seeking agreement on its nuclear programme, warning that Tehran's position undermines prospects for reviving the 2015 agreement

While European negotiators appeared to be making progress towards reviving the 2015 agreement with Iran largely agreeing to the text of the final proposal. But the degree of optimism declined when the United States sent its response, to which Iran, in turn, responded.

The three European powers said that the final proposal put to Tehran represented the "maximum flexibility" of European powers on the dossier, adding that "unfortunately, Iran chose not to use this crucial diplomatic opportunity", noting that Tehran "instead continues to escalate its nuclear programme beyond any reasonable civilian justification".

Tehran has reiterated issues related to its legally binding obligations under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), which have been reached with the International Atomic Energy Agency (IAEA). The three States reported that "the latter request raises serious doubts as to Iran's intentions and its commitment to a successful outcome in relation to the JCPOA".