North Korea says Sunday's launch tested the capability to carry a "large-size heavy nuclear warhead" and its ambassador in Beijing said on Monday that Pyongyang would continue such test launches "any time, any place".
North Korea's missile test this week marked a grave turning point that should rally a global response to the threat of a rogue nuclear state. "That is what all the current sanctions and pressure is ultimately striving for, to isolate North Korea but to engage in talks and negotiations".
Speaking to reporters ahead of a closed-door UN Security Council meeting, U.S. Ambassador to the United Nations Nikki Haley made it clear that Washington would only communicate with North Korea if it halted the nuclear program.
Tensions have been running high in the region, with Pyongyang launching what appeared to be its longest-range missile yet on Sunday.
Uruguayan Ambassador Elbio Rosselli, the current council president, said after the meeting that members are united in condemning the latest missile launch as "a serious threat to worldwide peace".
Guiding a long-range missile to a target on return to Earth is a key technological hurdle that North Korea must overcome in trying to ideal a missile that could threaten the United States.
US Ambassador Nikki Haley accused North Korea of intimidating the entire worldwide community with its nuclear programme, military ability and cyberattacks.
The threat to expand sanctions is the latest response from the USA following a North Korean ballistic missile test this past weekend.
Mr Trump wants South Korea to pay for the system, but Mr Moon has said he will reconsider the deployment, because of strong domestic opposition and also because of Chinese anger that Thaad upsets the regional strategic status quo and its suspicions that it will be used to spy on it.
Communications were severed by North Korea past year, Lee said, after new worldwide sanctions were imposed in response to its fifth nuclear test and Pyongyang shut down a joint industrial zone.
After months of sparring with increasingly threatening political rhetoric from both the United States and North Korea, the US has toned down its challenges to Kim Jong-un, even though earlier this month, Politico reported that the Democratic People's Republic of North Korea (DPRK) accused, through its Ministry of State Security, the USA of plotting the assassination of its leader, Kim Jong-un.
"The thought of placing cyanide in the hands of the North Koreans, considering their record on human rights, political prisoners, and assassinations is not only risky but defies common sense", Haley said in a statement.
He said North Korea "probably learned a lot" from last weekend's test.
McMaster told the envoy he's aware of the ongoing procedural difficulties in South Korea regarding the decision to host the anti-missile system. If accurate, it would be the highest of any of North Korea's recent missile launches.
Trump expressed interest in entering talks with the North under the right circumstances, but that he wasn't interested in talks that don't help produce solutions.