The remaining parties to the Iran nuclear deal will meet in Vienna on Wednesday, the European Union announced, as diplomats said the meeting will wrap up the latest round of talks on reviving the deal and adjourn discussions for at least a week.

Such meetings of the remaining parties - Iran, Russia, China, France, Britain, Germany, and the European Union - in a format known as the Joint Commission have punctuated and bookended indirect talks between Iran and the United States on both countries returning to full compliance with the 2015 deal.

The EU chairs Joint Commission meetings in the basement of a luxury hotel and leads shuttle diplomacy between Iranian envoys and a U.S. delegation based in another luxury hotel across the road. Iran refuses to hold direct talks with Washington.