Officials from Tehran and Washington will travel to Vienna next week as part of efforts to revive the 2015 nuclear deal between Iran and global powers, although they will not hold direct talks, diplomats said on Friday.

Even without face-to-face talks, which Tehran has ruled out, the presence of both of Iran and the United States in the Austrian capital would mark a step forward in efforts to bring all sides back into compliance with the accord.

The aim was to reach an agreement within two months, said a senior official with the European Union, the coordinator of the deal.

Former U.S. President Donald Trump pulled out of the deal in 2018 and reimposed sanctions on Iran, prompting Tehran to violate some of the pact’s nuclear restrictions. His successor Joe Biden wants to revive the accord, but Washington and Tehran have been at odds over who should take the first step.

“Iran and the U.S. will be in the same town, but not the same room,” a European diplomatic source said. A Western diplomat said a shuttle diplomacy approach would be adopted.

The talks will seek to create negotiating lists of sanctions that the United States could lift and nuclear obligations Iran should meet, the EU official said.

Those lists “should marry at some point. In the end, we are approaching this in a parallel way. I do think we can do it in less than two months,” the official said.