But Washington has also warned European allies that they face possible penalties if they violate US sanctions, which Washington says are aimed at reducing Iranian oil exports to "zero" - a level that would deprive Iran's economy of its principal source of revenue and economic growth.
The meeting Friday between Iran, Germany, Britain, France, Russia and China will consider proposals for salvaging the 2015 deal, known as the Joint Comprehensive Plan of Action, which is meant to prevent Tehran from developing nuclear weapons.
The top Iranian diplomat said the participants at the Vienna meeting agreed to take "good measures" to save the JCPOA.
Iranian Foreign Minister Javad Zarif has called on European powers to implement economic measures to protect the 2015 nuclear deal before USA sanctions against Tehran snap back between August and November.
The European Union has scrambled to find ways to counter the sanctions and ensure that Iran continues to enjoy the benefits of global sanctions relief under the deal, which was granted in 2016 in exchange for curbs on Iran's nuclear activities.
They said they remained committed to the accord and to building up trade and investment links with Iran, including "the continuation of Iran's export of oil and gas" and other energy products.
"We are trying to do it before sanctions are imposed at the start of August and then another set of sanctions in November". He said the package lacks workable solution and is a set of general commitments like the previous European Union statements.More news: Fate of inter-Korean detente hangs on nuclear talks
Speaking at a joint press conference with his Swiss counterpart, Alain Berset, in Bern on Tuesday, Iranian President Hassan Rouhani lashed out at American officials for threatening to stop Iran's oil exports, saying they would never be able to carry out such a threat.
Tehran has conditioned its stay in the deal to practical European strides to make sure Iran's dividends from the deal would not be affected when United States sanctions "snap back" in August.
US President Donald Trump signs a document reinstating sanctions against Iran after announcing the US withdrawal from the Iran nuclear deal, in the Diplomatic Reception Room at the White House in Washington, DC, on May 8, 2018.
But Le Drian also warned Iran to "stop the threats" to withdraw from the deal if it does not receive enough guarantees from Europe.
In another phone conversation with French President Emmanuel Macron late on Thursday, Rouhani described Paris' efforts to save the nuclear deal as "positive" but noted that "Europe's proposed package for keeping up cooperation in the JCPOA does not meet all our expectations".
The rial currency has fallen, prices have risen and the country has been hit by street protests and strikes. "We want to make clear to Iran that it will still gain economic benefits through this agreement".
The rally on Saturday was attended by thousands of people and attracted several United States politicians, including former NY mayor Rudy Giuliani, who is now President Donald Trump's personal lawyer.