At the same time, through negotiations, practical and effective measures should be taken to prevent the relevant parties from arbitrarily withdrawing from the JCPOA again and re-imposing sanctions, noted the Chinese diplomat.

In the current final stage of the negotiations, it is hoped that all parties concerned will redouble their efforts, maintain a rational and pragmatic attitude and reach a package of solutions as soon as possible, he added.

Alain Matton, an EU spokesperson, told journalists on Saturday that the EU will continue with the talks with all the participants to the JCPOA and separately with the United States "to find ways to get very close to a final agreement in the coming days."

Matton quoted Mora as saying a few days ago at a UN Security Council meeting that they are "working non-stop to revive the JCPOA in all its aspects, specifically the nuclear activities and the sanction-lifting."

"We are making progress but the negotiations are intense on a number of issues including on how steps are to be implemented," said the spokesperson.

The US administration under former President Donald Trump withdrew from the JCPOA in May 2018 and unilaterally reimposed sanctions on Iran. In response to the U.S. moves, Iran gradually stopped implementing parts of its JCPOA commitments from May 2019.

The JCPOA Joint Commission began to meet in offline format on April 6 in Vienna to continue previous discussions in view of a possible return of the United States to the JCPOA and on how to ensure the full and effective implementation of the JCPOA.