VIENNA—Western and Iranian officials kicked off talks on Tuesday on reviving the embattled 2015 nuclear accord, amid the challenge of bitter relations involving Washington and Tehran, punishing U.S. sanctions on the Islamic Republic and moves by Iran to speed up its nuclear action.

The get-togethers to the 2015 nuclear arrangement, which put limitations on Iran’s nuclear action in trade for lifting global sanctions on the state, experienced claimed on Friday that they would assemble in Vienna for talks. The Trump administration withdrew from the deal in Could 2018 and put sanctions on Iran. In return, Iran has taken methods to breach the arrangement and resume nuclear action.

The objective of the Vienna meeting is to produce a highway map for the U.S. and Iran to return concurrently to compliance with the deal.

The get-togethers agreed to proceed talking in the coming days in two parallel expert meetings, a person focused on how the U.S. is to carry sanctions on Iran, the other on how Iran will roll back again its nuclear activities to comply with the deal.

American and Iranian negotiators are not anticipated to meet immediately in Austria. As a substitute, diplomats from Iran, France, Germany, the U.K., Russia and China—parties to the 2015 agreement—met Tuesday afternoon in a person resort in central Vienna. The U.S. delegation, headed by Robert Malley, the White Property distinctive envoy for Iran, touched down in Vienna also on Tuesday afternoon and will keep at a individual resort nearby though European intermediaries shuttle involving the Iranian and American delegations.