In May, U.S. President Donald Trump pulled out of the deal under which sanctions on Iran were lifted in return for curbs to its nuclear programme.
He wanted Friday's meeting in Vienna of the foreign affairs ministers of the five countries committed to the agreement (Germany, China, France, United Kingdom and Russia), with their Iranian counterpart, to "enable the fulfilment of all of the Iranian demands for [Iran's] continued cooperation as part of the agreement".
Foreign ministers of China, Russia, France, Britain, Germany and Iran attend a meeting to discuss how to save the Iran nuclear deal following the US withdrawal, in Vienna, Austria, July 6, 2018.
Rouhani was quoted by state media and on his website after calls with French President Emmanuel Macron and German Chancellor Angela Merkel as having told them he was disappointed with their package which did not go far enough.
The other signatories - Britain, France, Germany, China and Russian Federation - have vowed to stay in the accord but appear powerless to stop their companies pulling out of Iran for fear of U.S. penalties.
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.
In calls with German Chancellor Angela Merkel and French President Emmanuel Macron on Thursday, Iranian President Hassan Rouhani said since the USA withdrawal "Iran has been dealing with economic issues and problems in banking relations and oil" and that foreign companies were "skeptical" about continuing their business, Iran's semi-official Mehr news agency reported.More news: Mecca Fire In Warm Springs Prompts Evacuation Notices
"We advise businesses that want to keep investing (in Iran), we want to keep payment systems open, and we want to build security through widening the mandate of the European Investment Bank", he said.
"We are trying to do it (economic package) before sanctions are imposed at the start of August and then the next set of sanctions in November".
"If the process of the European foreign ministers' meeting in Vienna, which is aimed at encouraging Iran to cooperate, is promising, we will continue our cooperation", he said.
"Failure to maintain and implement the deal would not only affect the Iran nuclear issue itself but also cause serious negative impacts on the functioning of the non-proliferation regime as well as on the situation in the Middle East", Wang said.
Since Trump s announcement, Iran s rial currency has fallen, prices have risen and the country has been hit by street protests and strikes.
Trump in May slammed the nuclear accord signed under his predecessor Barack Obama as "horrible" and "defective at its core", earning applause from Iran's regional rivals Saudi Arabia and Israel.
An Austria-based Iranian diplomat was among four people arrested on suspicion of plotting an attack on an Iranian opposition group in France last week.