UNITED NATIONS, Jan. 18 (Xinhua) -- A Chinese envoy to the United Nations said Wednesday that all parties concerned should reaffirm their political will and eliminate external interferences while dealing with Iran nuclear issue.

Wu Haitao, China's deputy permanent representative to the United Nations, gave a positive assessment of the implementation of the Joint Comprehensive Plan of Action (JCPOA) on Iran's nuclear program, noting the JCPOA "has registered good progress in the first year" and pledging China would continue to actively participate in the Joint Commission and Procurement Working Group.

Delegates from the UN Security Council on Wednesday called for continued implementation of the JCPOA, praising the historic accord as a significant diplomatic achievement that had made the world a safer place in the first year of its performance.

Briefing the security council on its resolution 2231, which endorsed the JCPOA, UN Under-Secretary-General for Political Affairs Jeffrey Feltman called on the international community to continue support and contribute to the implementation of the agreement.

"Since the JCPOA is not being implemented in vacuum, there will be difficulties and challenges along the way, and joint efforts are required," Wu said.

Parties concerned should "honor their commitment in strict accordance with the JCPOA, which is the fundamental guideline for action," he added.

They should also demonstrate good will and properly address technical issues "through peaceful consultation on equal footing in the search for lasting solutions," said the Chinese envoy, adding that "only in so doing, can the implementation of the JCPOA be successful and lasting."

The United Nations Monday welcomed the first anniversary of the achievement of "Implementation Day" under the JCPOA, which marked a significant milestone in the historic agreement related to Iran nuclear issue.

The JCPOA, known commonly as the Iran nuclear deal, is an international agreement on the nuclear program of Iran reached in Vienna on July 14, 2015 between Iran, the P5+1 (the five permanent members of the United Nations Security Council -- China, France, Russia, United Kingdom, United States -- plus Germany) and the European Union.

The 15-nation security council endorsed the JCPOA on July 20, 2015, calling it a "culmination of diplomatic efforts" by the E3+3 -- which includes Britain, China, France, Germany, Russia and the United States -- and Iran.