Iran has not made any agreement with the United States on its nuclear issue, an Iranian Foreign Ministry spokeswoman said on Saturday, denying recent western reports that the two sides have agreed to ship part of its enriched uranium abroad.

"No agreement has been made on the topics of (nuclear) negotiations so far," the spokeswoman said.

"The news aims at certain political ends to spoil the climate of talks and to complicate the issue," she added, referring to western reports on Friday that "Washington and Tehran have allegedly come to a step closer to agreeing on shipping part of Iran's enriched uranium stockpile to Russia."

The reports also said that the nuclear talks last December between Iran and the world powers resulted in a "catalogue of areas of potential accord."

On Dec. 18, Iran's top nuclear negotiator Abbas Araqchi said the deputy-ministerial-level talks in Geneva, Swithzerland, were "productive and positive discussions were held."

Araqchi described the atmosphere at the discussions as good, adding that "further meetings will be held."

Talks between Iran and the P5+1 group continued on Dec. 17, weeks after failing to meet a Nov. 24 deadline for a comprehensive nuclear deal.

On Wednesday, the spokeswoman said the next round of deputy-level talks will be held on Jan. 15.