China is North Korea's most important economic and diplomatic backer, despite its anger at Pyongyang's saber rattling.
"The relevant resolutions passed by the UN Security Council stipulate that ... adjustment to the sanctions has to be made in accordance with the situation on how North Korea has implemented the agreement - including suspending or removing relevant sanctions measures", Geng said.
"China has consistently held that sanctions are not the goal in themselves". He said: "We believe the Security Council should make efforts to support the diplomatic efforts at the present time".
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Geng said Beijing would continue to fulfil its worldwide obligations and play a constructive role on the Korean peninsula.
China shares a border with North Korea and is the country's largest trading partner. He taunted Mr. Kim as "little rocket man", and warned that the US would "totally destroy" North Korea.
"We hope that the two countries' highest leaders can dispel interference, establish mutual trust, overcome difficulties and can reach a basic consensus on promoting and achieving the denuclearization of the peninsula and promoting and establishing a peace mechanism for the peninsula", Wang told reporters.
He added that any chance of true success depends on North Korea and how serious it is when it comes to giving up nuclear weapons. One of North Korea's stated goals is to establish peace with the US and ultimately see the removal of more than 30,000 USA troops from the Korean Peninsula. "I think without Otto, this would not have happened", Trump said. "And this role will continue".