The official said the test would be of either an intermediate-range missile or North Korea's ICBM-known as a KN-20 or a Hwasong-14.
Long regarded as a formidable technological barrier for impoverished North Korea, that milestone could be reached, beginning with new tests expected to take place within days, US analysts said. Last month, Trump tweeted that he wished "we would have a little more help with respect to North Korea from China, but that doesn't seem to be working out".
"We're constantly in touch with China".
"It's not as fast as I would like but these are pretty serious sanctions and so I think that there is a lot of thought going into this".
The US may target Chinese companies as part of new North Korea sanctions, an administration official said this week, even as diplomats are working with Beijing at the United Nations to reach a new worldwide agreement.
The United States has been locked in negotiations with China for almost three weeks on a new raft of measures, and Haley said China was negotiating with Russian Federation separately on possible tougher sanctions.
One possible stumbling block is whether the new resolution will refer to North Korea's ICBM test.
New Trump communications chief vows to 'stop those leaks'
Trump's own national security officials, however, recently reaffirmed that Russian Federation was behind the hacking campaign. We're strong as our weakest leak, ' Scaramucci said. "The President is thinking about pardoning nobody", Scaramucci said.
"I don't see the PLA at this time being particularly enthusiastic about being tasked to undertake a potential near-term mission in North Korea", he said.
"We can't afford to argue with North Korea because it will completely cast Russia to the sidelines", said Georgy Toloraya, head of the Russian Academy of Science's Center for Asian Strategy.
Following the launch, South Korea's intelligence service said that it was unlikely the North had succeeded in "securing the technology", pointing out that the pariah state lacks the appropriate testing facilities and casting doubt over whether the missile reentered the atmosphere.
Meanwhile, there have been reports from United States military sources indicating that North Korea could be bracing for another missile launch to be carried out as soon as this week. Nobody knows the real level of trade since many goods go via third countries, though it may be worth $500 million, according to Toloraya.
President Donald Trump's administration has been frustrated that China has not done more to rein in North Korea and senior officials have said Washington could impose new sanctions on Chinese firms doing business with Pyongyang.
"If any situation of violating of the UNSC resolutions happen, we will deal with the issue by ourselves based on the Chinese domestic laws". "Over the years, we've seen photographs of North Korean and Iranian officials in each other's countries, and we've seen all kinds of common hardware".
The government had asked the North to answer the South's call by Thursday, but the North has yet to respond.