Besides, Commander of the IRGC Quds Force Qasem Soleimani on Tuesday lauded Rouhani for responding strongly to a USA plan aimed at blocking Iran's oil sales, saying "this is the Dr. Rouhani we used to know and the one he should be".
Speaking after three hours of talks, European Union foreign policy chief Federica Mogherini, who chaired the talks, read a statement from the six delegations repeating previously-announced broad priorities ranging from guaranteeing Iranian oil revenue to shipping ties, banking and all other trade and investment co-operation.
World powers and Iran appeared to make no concrete breakthrough on Friday in talks to provide Tehran with an economic package to compensate for USA sanctions that begin taking effect in August.
The Iranian president has stressed the importance of fulfilling Tehran's demands for the continuation of the Islamic Republic's cooperation with the remaining signatories to the 2015 nuclear agreement.
"It would be meaningless that Iran cannot export its oil while others in the region can".
The five powers' top diplomats were due to join Iranian Foreign Minister Mohammad Javad Zarif from 0900 GMT in the Austrian capital, where the accord was signed in 2015.
Ministers from Britain, China, France, Germany and Russian Federation meet their Iranian counterpart in Vienna for the first time since US President Donald Trump left the pact in May, but diplomats see limited scope for salvaging it.
Ahead of Friday's meeting, French Foreign Minister Jean-Yves Le Drian said it was unlikely for Europe to put together an economic package for Iran before November. "For the start August, it seems a bit short, but we are trying to do it by November", he said.
German Foreign Minister Heiko Maas also said that world powers would not be able to fully compensate for companies who are abandoning their operations in Iran.
"If Iran's oil exports are [stopped], we will not give permission for oil to be exported to the world through the Strait of Hormuz", Kowsari said, as cited by Bloomberg.
Iran's economy is already suffering from the sanctions that Washington re-imposed after walking away from the nuclear agreement, and the USA has threatened to punish companies from other nations that continue doing business with Iran.
"We will not be able to compensate for everything that arises from companies pulling out of Iran", Maas told reporters before the new round of talks among the remaining parties to the deal.
If Iran can not sell its oil under U.S. pressure, then no other regional country will be allowed to either, said Mohammad Ali Jafari, who commands the Islamic Revolutionary Guard Corps, Iran's most powerful military force.
Now, the threat of US sanctions has increasingly darkened the outlook for Iran's economy, helping to stoke a plunge in the Iranian rial this year that has driven up prices and provoked street protests and strikes.