After the latest missile test "now no one can infringe our sovereignty and rights to survive and develop", Vice Chairman Pak Kwang-Ho of the party's decision-making Central Committee said, adding that the U.S. had been "jolted" at the strengthening of North Korea's nuclear force and could attempt to commit "robber-like" provocative acts.
But her call for nations to "cut off all ties with North Korea" was rejected by Moscow, with foreign minister Sergei Lavrov saying Russian Federation saw the proposal "negatively". However, North Korea's leader Kim Jong-un called the launch "impeccable" and a "breakthrough". However, the leader was seen celebrating the launch on Wednesday, after it was accomplished, with the Korean Central News Agency (KCNA) publishing photos with a smiling Kim Jong-un inspecting missile equipment.
At the end of November the USA unveiled fresh sanctions against the North, which it said were created to stop its funding of nuclear and ballistic missile programmes.
"The Chinese envoy, who just returned from North Korea, seems to have had no impact on Little Rocket Man", Trump said on Twitter, a day after speaking with Chinese President Chinese President Xi Jinping and reiterating his call for Beijing to use its leverage against North Korea.
Reports have speculated the nuclear test site will have to close because of the tremors, but 38 North said "complete abandonment of the test site as a whole remains unlikely".
Nikki Haley, the U.S. ambassador to the United Nations.
"We know they were building to this".
He called Haley's speech on North Korea, which she made at an emergency UN Security Council meeting, "a really bloodthirsty tirade".
"We have never sought war with North Korea and still today we do not seek it".
In spite of Trump's rhetoric and warnings that all options, including military ones, are on the table in dealing with North Korea, his administration has stressed it favors a diplomatic solution to the crisis.
A White House statement about the phone conversation between the U.S. and Chinese leaders said Mr Trump made clear "the determination of the United States to defend ourselves and our allies".
The US has repeatedly said that it will not accept North Korea as a nuclear power and that it will consider military intervention to stop it.
North Korea tested a new ICBM, which Pyongyang claims is capable of reaching any target in the continental United States.
The US warned North Korea's leadership will be "utterly destroyed" if war breaks out but its call for nations to cut ties with Pyongyang was rejected by Moscow while Beijing sidestepped talk of an oil embargo.
"We need China to do more", Ms Haley said on Wednesday.