"The best signal that North Korea could give us that they're prepared to talk would be to stop these missile launches".
The measures aim to make it harder for North Korea to make money across the globe.
"We will know it when we see it", he told reporters.
Wang said that apart from the new sanctions, the resolution also made clear that the six-party talks process, a stalled dialogue mechanism with North Korea that also includes Russian Federation and Japan, should be restarted. He's not specifying what those are. The US has been the main protagonist pushing for the ban, which will hit $1bn of North Korean exports, but China and Russian Federation have stressed the need for dialogue accusing the US of raising tensions with military exercises on the peninsula. Concern has mounted that North Korea is developing its missile technology quicker than expected, after tests last month of missiles that experts said are capable of striking the US mainland, perhaps as far inland as Chicago.
In this context, Tillerson used the weekend gathering of the ASEAN regional forum, Asia's biggest security group that also includes "outside" nations such as the United States, North Korea and Japan, to try to isolate Pyongyang by "drastically" reducing their dealings with it.
The two leaders also welcomed the U.N. Security Council resolution that unanimously passed 15-0.
"We will make the USA pay by a thousand-fold for all the heinous crimes it commits against the state and people of this country", the statement said.
"We actually had very thorough talks", Wang said afterwards. Instead, the USA was represented at the dinner by Thornton, whose official title is acting assistant secretary of State for East Asia and Pacific Affairs.
"We welcome the opportunity to address their concerns and correct the perceptions they may have gleaned from exaggerated media reports", the DFA said.
Wang met his North Korean counterpart Ri Yong Ho on Sunday for bilateral talks that started off in a cordial way, with Ri smiling continuously as the two shook hands.
In a statement, Pyongyang charged back against the latest sanctionsas a punitive measure for the regime's ongoing missile tests, and launched new threats against the USA, as well as the rest of the countries that support Washington, reports Efe news. What's the loss of trade with North Korea compared to the economic bounty available in the west?
Still, this is a legitimate diplomatic victory for the Trump administration, albeit an incremental one.
But Washington says it will be watching closely to ensure that China doesn't ease up on the North - if and when the world's attention is diverted elsewhere.
Rex Tillerson, the U.S. secretary of state, raised the prospect of Washington holding dialogue with North Korean officials in comments he made at the forum. Thornton reiterated Sunday that the US rejects such a "freeze-for-freeze", calling it a false moral equivalency. "Sanctions are needed but sanctions are not the final goal", Wang said.
Thornton says the USA wants to ensure that with the new sanctions, there's "not this kind of episodic back and forth that we've seen".
Earlier on Monday, Pyongyang vowed it would deliver "thousands-fold" revenge against the U.S. over the fresh sanctions. She says the US rejects any "moral equivalency" implied by that proposal.
Chinese Foreign Minister Wang Yi, meeting with North Korea's top diplomat during the gathering in Manila, urged the North to "maintain calm" despite the United Nations vote.
Last week, Mr Tillerson said North Korea needed to cease both its missile launches and nuclear weapons tests for talks to begin.
The North said it would take an unspecified "resolute action of justice" and would never place its nuclear program on the negotiating table or "flinch an inch" from its push to strengthen its nuclear deterrence as long as US hostility against North Korea persists.
Trump had been urging Chinese leadership to take a more active role in pressuring North Korea over its nuclear program. And it gives President Xi another bargaining chip if the United States presses him on trade issues such as intellectual property rights, technology transfer or currency manipulation in the future.
Recent U.S. rhetoric has heightened global concerns that Trump might now be thinking more seriously about a pre-emptive strike on Pyongyang's nuclear facilities.
The White House praised China's move to join a unanimous U.N. Security Council resolution slapping new sanctions that could cut off about one-third of the North's roughly $3 billion in annual exports.
Pyongyang also clarified that the nuclear program was prepared against a possible threat from the USA, but it is ready to go on the offensive against countries that join the U.S.
Tillerson is due to meet Wang and Russia's Foreign Minister Sergei Lavrov later on Sunday, seeking to intensify Kim Jong-Un's diplomatic isolation and reduce the risk of renewed conflict. Condemned by North Korea, China and Russia, THAAD is being deployed by Washington in South Korea as a defense against possible missile launches by Pyongyang.
"Who has been carrying out the U.N. Security Council resolutions concerning North Korea?".