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.
"After the withdrawal of the United States, which we can't understand, we face a hard situation", he said.
The statement sent a positive signal, while the meeting was shadowed by Iran's dissatisfaction with the European Union (EU)'s offer to secure its economic interests by anti-sanction measures.
During a visit to Europe this week President Hassan Rouhani warned that Iran could reduce its co-operation with the United Nations nuclear watchdog having already threatened Trump of the "consequences" of fresh sanctions against Iranian oil sales. Washington has since told countries they must stop buying the OPEC producer's oil from November, 4 or face financial consequences.
Friday's statement lists key fields to support Iran to secure its economic interests, including "the maintenance and promotion of wider economic and sectoral relations with Iran; the preservation and maintenance of effective financial channels with Iran; the continuation of Iran's export of oil and gas condensate, petroleum products and petrochemicals; the continuation of sea (including shipping and insurance), land, air and rail transportation relations", manly to shield the country's backbone of the economic sector from US sanctions.
During a telephone call with the French President, Emmanuel Macron, Mr Rohani stated that "Europe's proposed package to Iran for continued cooperation as part of the Joint Comprehensive Plan of Action (JCPOA - the official abbreviation of the agreement, editor's note) does not meet all of the demands of the Islamic Republic". Several major firms - including France's Total and Peugeot, and Russia's Lukoil - have said they are preparing to leave.
"We will not be able to compensate for everything that arises from companies pulling out of Iran", Heiko Maas told reporters before a round of talks among the remaining parties to the deal.
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The foreign ministers agreed on an 11-point list of joint goals in the Austrian capital, where the accord was signed three years ago with the aim of reining in Iran's atomic programme in return for sanctions relief that promised greater trade and investment.
Since Trump s announcement, Iran s rial currency has fallen, prices have risen and the country has been hit by street protests and strikes.
Any confirmation that Iranian authorities were behind the plot could make it politically hard for European leaders to continue to back the nuclear deal.
Supreme leader Ayatollah Ali Khamenei has vowed that Iran "will never tolerate both suffering from sanctions and nuclear restrictions". The demands have been rejected by Iran.
The new round of diplomacy has been clouded after security services said they had foiled an alleged plot to bomb a Paris rally by an exiled Iranian opposition group, the People's Mujahedeen of Iran.
Tehran dismissed it is an orchestrated "false flag ploy", created to discredit Iran and overshadow Rouhani s trip to Europe, and Wednesday summoned the French and Belgian ambassadors and the German charge d affaires in protest.