An Iranian top nuclear negotiator says the Sextet of powers have agreed to unfreeze USD 2.8 billion in Iranian assets over the next four months.

According to Press TV, Abbas Araqchi told reporters early on Saturday after the end of Tehran’s sixth round of nuclear talks with the P5+1 group in the Austrian capital of Vienna “Over the next four months, USD 2.8 billion will be deposited into Iran’s account in six installments,”.

Araqchi, who is also Iran's deputy foreign minister for legal and international affairs said “Four USD 500-millon and two USD 400-million tranches will be paid to Iran at three-week intervals beginning August 1.”

US Secretary of State John Kerry said at a different presser in Vienna that 2.8 billion dollars of Iranian funds would be unfrozen during the new round of talks.

Araqchi noted under the agreements made during the 18-day negotiations, Iran will convert its 20-percent-enriched uranium, already oxidized under the Geneva interim deal, to fuel for Tehran Reactor,.

On Friday, Iranian Foreign Minister Mohammad Javad Zarif and European Union foreign policy chief Catherine Ashton announced in a statement that Iran and the Sextet of world powers had agreed on the extension of talks over Tehran’s nuclear energy program until November 24.

The original deadline for a comprehensive deal between the two sides was due on July 20.

The statement said a new round of negotiations will kick off in the "coming weeks."