Brent crude prices rose to a almost four-year high above above $82 a barrel on Tuesday after OPEC and its allies said they would stick to the plan they agreed to in June.
Several European diplomats said the SPV idea was to create a barter system, similar to one used by the Soviet Union during the Cold War, to exchange Iranian oil for European goods without money changing hands.
Mr. Rouhani also did not rule out talks, but a change in USA policy will be needed first.
Daniel Jaeggi, the president of the commodity merchant Mercuria Energy Trading, said that because of the US sanctions against Iran, millions of barrels per day (bpd) of crude oil could be taken out of the market by the end of the fourth quarter this year, making oil prices spike up to $100 a barrel.
"The main culprit of the price hikes ... and the destabilisation of the market is Mr Trump and his disruptive and illegal policies", Zanganeh said on state television, after the USA president hit out at OPEC, accusing it of "ripping off the rest of the world".
The so-called "OPEC+" group, which includes non-OPEC members such as Russian Federation, met over the weekend but did not decide to boost output. Washington wants to reduce Iran's oil exports effectively to zero with renewed sanctions in November and has been encouraging its allies to cut their oil imports from Iran.
That threw a bit of cold water on bullish forecasts issued this week by trading giants Mercuria Energy Group Ltd and Trafigura Group, who said that supply losses could send oil back above $100 a barrel.
Zanganeh said if Trump wanted prices to ease then he had to "stop his unwarranted interference... in the Middle East and not prevent Iran's production and exports".
The bank's analysts said in a note Tuesday that "another supply catalyst beyond Iran would likely be needed for prices to meaningfully break to the upside".
Oil at $100? Not so fast, says Goldman Sachs.
"Undoubtedly the oil market is expected to be tight in coming months and, if OPEC's own numbers are to be believed, global oil inventories are to fall during the remainder of the year".
At the same time, the demand worldwide is reaching 100 million barrels per day for the first time in history.
Release of USA crude data will be watched closely by oil investors going forward.