When he announced that the United States would withdraw from the JCPOA in May, President Donald Trump observed that since the deal was implemented, Iran's military budget grew by 40% and its "bloody ambitions have grown even more brazen".
Foreign ministers of China, Russia, France, Britain, Germany and Iran met in Vienna on Friday to discuss how to save the landmark deal following the USA withdrawal.
The top diplomats of Iran and five world powers meet Friday as Tehran seeks assurances it will benefit economically from the nuclear deal despite the United States withdrawal from the pact. Washington has since told countries they must stop buying the OPEC producer's oil from November, 4 or face financial consequences.
The meeting was chaired by EU High Representative Federica Mogherini and attended at the ministerial level by China, France, Germany, Russia, Britain and Iran.
The diplomats said they remained committed to the 2015 accord and to building up economic relations with Iran, including "the continuation of Iran's export of oil and gas" and other energy products.
"The Iranians expect the others to say what we are going to do to keep the deal alive".
"SWIFT is the key but Iran has to stay in at least until the end of the year to maintain divisions between the European Union and United States, keep some credibility and try and survive amidst forthcoming sanctions", said Sanam Vakil, Associate Fellow at Chatham House, a London-based worldwide think tank.
The Vienna meeting of foreign ministers will discuss the European offer that aims to persuade Iran to stick with the 2015 deal, a European diplomat said without specifying the measures.
Iranians have complained that the hoped-for rise in foreign investment and trade after the deal has not materialized.
The Iranian President, Hassan Rohani, believes that the entirety of measures offered by the Europeans, to compensate for the effects of the U.S. government's withdrawal from Iran's global nuclear programme, have not to date proven satisfactory. The rial currency has fallen, prices have risen and the country has been hit by street protests and strikes. Iran has said it had nothing to do with the plot and has demanded the official be released without delay.
Rouhani, who signed the nuclear deal, has been attacked at home by ultra-conservatives, who have denounced his willingness to talk to the West and accused him of hurting the economy.
Six people were arrested - a diplomat attached to the Iranian embassy in Austria - in Belgium, France and Germany, while the opposition group blamed the Iranian regime for the alleged plot.