Abbas Araqchi said on Saturday that about 60-65 percent of the text has been completed, noting that there are still differences between the two sides over "major and serious” issues, Press TV reports.
"We have made progress on substantive issues, but we have not reached a full agreement on the main substantive issues yet,” Araqchi said, expressing hope that the two sides would make further progress after the foreign ministers of some of the six countries arrive in Vienna.
Araqchi stated that the Iranian negotiating team will "seriously” pursue the talks but stressed that the delegation will not back away from the Iranian nation’s rights.
On July 3, Iran and the five permanent members of the UN Security Council – the United States, Russia, France, Britain and China - plus Germany formally kicked off their sixth round of talks this year in Vienna to discuss a permanent accord on Tehran’s nuclear energy program.
The foreign ministers of the six countries have been invited to attend the ongoing negotiations. US Secretary of State John Kerry and French Foreign Minister Laurent Fabius are reportedly due to join the talks.
Iran and the six countries have been discussing ways to sort out differences and achieve a final deal that would end the decade-old dispute over Iran’s nuclear energy program.
The two sides sealed an interim deal in Geneva, Switzerland, on November 23, 2013. The deal came into force in January and expires on July 20, but can be extended depending on the agreement of all parties involved.