Haley also criticised Moscow, after Russian President Vladimir Putin responded to North Korea's latest missile launch by saying that while his country opposed Pyongyang's nuclear programme, it was unacceptable for countries to intimidate North Korea.
China says its influence has been exaggerated and has called on South Korea and the U.S.to end large-scale wargames seen as threatening by North Korea in exchange for the North suspending its missile launches and nuclear tests.
All 15 members of the Security Council including North Korea's closest ally China called the launch a violation of United Nations sanctions and vowed to take new measures, including additional sanctions.
A rap group backed by China's government is warning South Korea in a music video that "you're going too far" with the deployment of a US missile defense system, as Beijing seeks to bring its state-supported cultural forces to bear in the worldwide dispute.
Tillerson said Washington would guarantee Pyongyang regime security if certain conditions are met, according to South Korean special envoy Hong Seok-hyun. Those relatively few North Koreans who are fortunate to own cars saw this with their own eyes last month, as fears that China would decrease exports of oil sent gasoline prices skyrocketing by as much as 83 percent.
"We consider that nuclear and missile tests are unacceptable", Putin said.
Lesser than a week ago, Choi Son Hui, head of US affairs for North Korea's foreign ministry, told media that Pyongyang would consider "dialogue" with the U.S.More news: NSA Told Microsoft of Flaw Before Ransomware Attack
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Symantec and Kaspersky Lab said on Monday that some code in an earlier version of the WannaCry software had also appeared in programs used by the Lazarus Group, which researchers from many companies have identified as a North Korea-run hacking operation.
South Korea's President Moon Jae-In (C) and cabinet members attend an emergency meeting of the National Security Council (NSC) at the presidential Blue House in Seoul on May 14, 2017. Afterward, a spokesman told reporters that Moon remains "open to the possibility of dialogue with North Korea" but that it's only possible with a "change of attitude" in Pyongyang.
Moon has said that he would meet with the North Korean leader, Kim Jong Un, if the circumstances were right.
China's top diplomat, Foreign Minister Wang Yi, on Thursday reiterated calls for its dismantling.
"We're now at a crossroads in our relations", Wang told Lee as he urged the new South Korean administration to make a decision to "remove the obstacles" that stand in the way of healthy ties between the two Asian economic powerhouses.
Such moves underscore a willingness on the part of China's Communist Party leaders to fan the flames of anti-South Korea sentiment, said Korea expert Sung-Yoon Lee of Tufts University in MA.