"This agreement can not be implemented if one of the participants unilaterally steps out of it, " Lavrov warned, adding that he expects the Trump Administration to "try to convince the European states to take the same position".
"Global anxieties about nuclear weapons are the highest since the Cold War", Guterres said.
China's deputy United Nations ambassador, Wu Haitao, urged all countries to "reject Cold War mentality" and commit to peaceful solutions, including on the Korean Peninsula where he pointed to "some positive changes" emerging. It was precisely on the DPRK that a greater commitment was needed to solve tensions on the Korean peninsula, he deemed. He said he was confident the two countries would "get to that negotiating table".
Some 20 countries, mostly those which joined the USA in its aggression war against North Korea in 1950s, participated in the meeting on January 15-16.
Iran and six world powers, including the U.S., UK, France, Russia, China and Germany, struck the nuclear deal, also called the Joint Comprehensive Plan of Action, on July 14, 2015.
Secretary-General Guterres also expressed concern that trust between Moscow and Washington "continues to ebb" on nuclear and other issues including "vital strategic arms reduction measures established during and after the Cold War".
Russia's Foreign Minister Sergei Lavrov speaks during a news conference at United Nations headquarters Friday Jan. 19 2018
Palo Alto: Secretary of state Rex Tillerson has voiced confidence North Korea will eventually negotiate with the United States, saying China's cooperation with a US- led pressure campaign was starting to affect its reclusive ally's thinking.
Tillerson said the U.S. supports rapprochement between North and South Korea, which announced yesterday they'd march under a common flag at next month's Olympics in South Korea.
"It also provokes profound disagreements among members of the worldwide community".
He has also complained that the JCPOA-related restrictions have an expiration date and that underscores the need for toughening the "embarrassing" deal.
The U.S. and Russian Federation also sparred over chemical weapons in Syria.
"Militants not only are using processed chemicals but they also have their own technological and manufacturing capacities to synthesize full-fledged military toxic substances", he warned.