Experts from Iran and six world powers will resume talks in Geneva next week, December 30, on implementing the interim Iran nuclear deal signed last month, western and Iranian diplomats said Friday, as a top advisor to Iranian Supreme Leader Ali Khamenei strongly endorsed one-on-one nuclear talks with the United States and members of the P5+1.

The resumed talks in Geneva Monday on implementing the Joint Plan of Action are currently expected to last for one day, and will involve nuclear and sanctions experts, not political directors, a spokeswoman for European Union foreign policy chief Catherine Ashton told Al-Monitor.

The main issue to be resolved concerns different interpretations of certain aspects of the Joint Plan of Action, an official involved in the negotiations, speaking not for attribution, told Al-Monitor Friday. If there is a need, a higher level meeting involving political directors might be a possibility at a later date, he said.

Implementation of the JPA, signed by the foreign ministers of Iran and six world powers in Geneva November 24, is now envisioned to start in the second half of January, Reuters reported.