“What is being pursued and discussed in Vienna is presentation of a clear and transparent image concerning the removal of the sanctions [imposed on the US on Iran],” Kazem Gharibabadi told reporters on Sunday, IRNA reported.

“Identifying and listing the steps for the removal of sanctions are necessary in order to examine how serious Washington is in its claim about being willing to return to and fully honor the JCPOA, and to check whether it fits [Iran’s] declared policy,” he said, using the official acronym of the nuclear agreement.

Gharibabadi, a top negotiator who is currently engaged in the multilateral talks in Vienna, said Iranian negotiators act in accordance with the Islamic Republic’s principles as set out by Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei. The Iranian negotiators regularly report the results of the talks to senior officials for consideration and decision-making, the top diplomat added.

The talks began early this month and include the remaining parties to the JCPOA, namely Iran, Russia, China, France, Britain and Germany, while excluding the US, which unilaterally left the deal three years ago to give itself leeway to indulge in unprecedented rounds of sanctions on Tehran.

Iran responded to the United States’ “maximum pressure” campaign by taking increasingly strong actions to advance its nuclear program – the latest of which was enriching uranium to 60% purity- until until the sanctions are rescinded.

Within the format of the JCPOA Joint Commission meetings in Vienna, two expert-level working groups have been set up to lift the US sanctions against Iran and coordinate Tehran's return to full compliance with its nuclear obligations under the deal.
Mikhail Ulyanov, the Russian ambassador to international organizations in Vienna, said on Sunday that the working groups continued to work “on sanctions lifting and nuclear issues in the afternoon yesterday and today.”

“Their tasks are not easy but the process is going on,” Ulyanov said via Twitter.
  A day earlier, Abbas Araqchi, Iran’s chief negotiator, said the participants reviewed the reports presented by the working groups and held “good discussions” about ways to lift sanctions.

“It seems that a new understanding is emerging and there is now common ground among all [the sides] on the final goal,” Araqchi, who also serves as Iran’s deputy foreign minister for political affairs, said after the Saturday meeting.