Tehraninfo-icon: Iraninfo-icon wants European powers to present it with measures by the end of May to compensate it for the U.S. decision to abandon the 2015 nuclear deal, a senior official said on Friday, and Tehran would decide within weeks whether to quit the accord. 

At Iran's request, delegates from Chinainfo-icon, Russiainfo-icon, Franceinfo-icon, Britaininfo-icon, Germanyinfo-icon and the European Unioninfo-icon gathered on Friday in Austria's capital, Vienna, where they reaffirmed their commitment to the 2015 deal, formally known as the Joint Comprehensive Plan of Action (JCPOA).

The 2015 agreement between Iran and worldinfo-icon powers lifted international sanctions on Tehran. In return, Iran agreed to curbs on its nuclear program. 

Since U.S. President Donald Trumpinfo-icon pulled Americainfo-icon out last month, European states have been trying to find a way to ensure Iran still gets the economic benefits to persuade it to stay in the deal. But that has proven difficult, with European companies frightened away by U.S. sanctions. 

Britain, China, France, Germany and Russia - began meetings on Friday for the first time since Trump left the pact, but diplomats see limited scope for salvaging it. Their officials will try to flesh out with Iran's deputy foreign minister a strategy to save the deal by keeping oilinfo-icon and investment flowing. 

"To be honest with you, we are not confident," a senior Iranian official told reporters on Friday before the talks. 

EU leaders have united behind the accord, with Brussels working on measures, including banning EU-based companies from complying with re-imposed U.S. sanctions and urging governments to make money transfers to Iran's central bank to avoid fines. 

"We expect the (economic) package to be given to usinfo-icon by the end of May," the Iranian official said. "I'm sorry to say that we haven't (seen) the Plan B yet. The Plan B has just started to be figured out." 

He said European measures would need to ensure that oil exports did not halt, and that Iran would still have access to the SWIFT international bank payments messaging system. 

Abbas Araghchi, Iran's deputy foreign minister, told reporters in Vienna that Tehran was negotiating with the other signatories to "to see if they can provide us with a package which can give Iran the benefits of sanctions lifting".

"The next step is to find guarantees for that package," he said, adding that Iran needed specifics on how that would happen by the end of May.

Washington has not only promised to impose "the strongest sanctions in historyinfo-icon" on Tehran, but also threatened to punish companies that trade with it. Some Western companies have already quit Iran or said they may have to leave because of the new US sanctions.

For Iran to stay in the deal, Araghchi said "specific mechanisms and practical solutions" were required to convince companies to continue doing businessinfo-icon with Tehran, and address its concerns over its oil exports and banking flows.

He said talks would continue over the next few weeks "particularly at an expert level", after which Iran would decide whether or not to stay in the accord.

"We got the sense that Europeans, Russia and China ... are serious and they recognise that JCPOA's survival depends on the interests of Iran being respected," Araghchi added.

He said that in theory the deal could survive without the US, but acknowledged "in practice I'm not sure".

Russian delegate Mikhail Ulyanov struck an upbeat note after the meeting, saying: "We have all chances to succeed, provided that we have the political will.

"I must tell you that the JCPOA is a major international asset. It does not belong to the United Statesinfo-icon, it belongs to the whole international community."

In a statement after the talks, Helga Schmid, the EU representative who chaired the meeting, said parties to the deal discussed "practical solutions" to ensure, among others, the continued sale of Iran's oil and gas, protection of businesses investing in Iran, as well as effective banking transactions and transport links.  

Trump denounced the accord, completed under his predecessor, Barack Obama, because it did not cover Iran's ballistic missileinfo-icon program, its role in Middle Eastinfo-icon conflicts or what happens after the deal begins to expire in 2025. 

Washington has not only re-imposed sanctions but started to make them even tighter. U.S. Secretary of State Mike Pompeo on Monday threatened Iran with "the strongest sanctions in history" if it did not change its behavior in the Middle East. 

"Pompeo was like taking a cold shower," said a European diplomat. "We'll try to cling to the deal, but ... we're under no illusions." 

The Iran official said time was running out and that if Tehran was not satisfied by European efforts, Iran would seek a ministerial meeting before making its decision. 

Iran has struggled to benefit from the accord so far, partly because of remaining unilateral U.S. sanctions that have deterred major Western investors from doing business with Tehran. Some Western companies have already quit Iran or said they may have to leave because of the new U.S. sanctions. 

Iran's supreme leader set out conditions on Wednesday for Iran to stay in the deal: unless Europe guarantees Iran's oil sales will not be hurt, Tehran would resume enrichment of nuclear material. He also rejected any new negotiations over Iran's missile program, which was not covered in the nuclear deal. 

"Our position is very clear: make the JCPOA (Iran deal) a successful story, then come to us and ask for dialogue or discussion or negotiation on other subjects," the Iranian official said. 

French President Emmanuel Macron wants to complement the nuclear deal with negotiations between all sides over other issues, an idea cautiously received by Russian President Vladimir Putin during talks in St. Petersburg on Thursday . 

European nations share U.S. concerns, but they say that torpedoing the nuclear deal makes them far harder, not easier, to address. They have said that as long as Tehran meets its commitments, they would remain in the deal. 

The International Atomic Energy Agency, which polices the pact, said on Thursday that Iran continued to comply with its terms, but could be faster in allowing snap inspections . Its chief, Yukiya Amano, briefed participants before Friday's meeting.