Iran and six world powers are expected to break off negotiations on Monday and meet again next month after missing a deadline to clinch a final deal to resolve their 12-year standoff over Tehran's nuclear ambitions, diplomatic sources said, Reuters reported.
Details about the resumption of negotiations were still being worked out, though one source said on condition of anonymity that Iran could not expect any new sanctions relief for the time being. Possible venues could include Vienna and Oman, one of the sources said, though nothing had been decided.
"Given progress made this weekend, talks headed to likely extension with experts and negotiating teams reconvening in December at a yet-to-be-determined location," a Western diplomat said in an email. The diplomat declined to be identified.
The deadline for a deal, agreed in July when the two sides missed an earlier target date, was Monday.
"Some progress has been made," said another diplomat involved in the talks. "But we need to discuss some issues with our capitals. We will meet again before the new year. This is an ongoing process."
The talks in Vienna aim for a deal that could transform the Middle East, open the door to ending economic sanctions on Iran and start to bring a nation of 76 million people in from the cold after decades of hostility with the West.
The cost of failure could be high. Iran's regional foes Israel and Saudi Arabia are watching the Vienna talks nervously. Both fear a weak deal that fails to curtail Tehran's nuclear ambitions, while a collapse of the negotiations would encourage Iran to become a threshold nuclear weapon state, something Israel has said it would never allow.
Some Iranian media have also reported on the possibility of an extension of the negotiations. Sources close to the talks told Reuters a formal extension of an interim deal agreed a year ago in Geneva was being discussed though it was unclear how long the negotiations would be prolonged.