The latest set of nuclear talks between Iran and the 5+1 Powers has adjourned after four days in Vienna, with resumption scheduled for next Wednesday.

The political deputies of the Islamic Republic and the 5+1 (US, Britain, France, Russia, China, and Germany) met on Friday to review progress in the final draft of a comprehensive agreement.

No details were released of the discussion. The two sides are seeking a resolution by a June 30 deadline.

Key issues continue to be the timing of the removal of UN, European Union, and US sanctions in return for limits on Iran’s nuclear facilities, uranium enrichment, and in-country stock of uranium. However, International Atomic Energy Agency head Yukiya Amano raised the prospect early in the week of tension over access to Iran’s military sites — he called for unrestricted access at any time, which Iran has flatly refused to consider.