South Korea's military on Tuesday fired warning shots against an unidentified flying vehicle crossing a military demarcation line that separates the two Koreas, Seoul's Joint Chiefs of Staff said.
"The midrange surface-to-surface solid-fuel missile Pukguksong-2 launched successfully", North Korea stated.
Past South Korean administrations punished North Korea with sanctions in response to tests.
Diplomatic officials did not say what the agenda was for the Tuesday Security Council meeting, but on earlier such occasions the body has ended its deliberations with a unanimous condemnation of Pyongyang's challenges to the global community.
Jeffrey Lewis, of the California-based Middlebury Institute of International Studies, said North Korea would probably continue to test the missile after deployment, fixing flaws as they emerged.
Even so, the test defies United Nations Security Council resolutions and sanctions.
There has been an escalation of tensions in the Korean Peninsula owing to repeated weapons testing by Pyongyang and tougher rhetoric, as well as a threat of pre-emptive strikes, by the US.
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Kim Jong Un is pushing ahead with its nuclear and missile programs, despite objections from China, its only major ally, saying the weapons are needed for defense against American aggression.
That missile launch showed that North Korea's technology seems to be getting more sophisticated, and it represented a significant advance for Kim Jung Un and his nuclear weapons program, Martin reported.
That number is an estimate derived from a report, jointly prepared by USA and South Korea militaries, that states North Korea could have as many as 900 ballistic missiles in its arsenal, according to the report.
"We are aware that North Korea launched an MRBM".
"The Trump administration would be well advised to lend an ear to the voices of concern that are heard from the US and the global community", the North's Minju Joson newspaper said in a commentary Sunday.
"If you are a country that is supplying or supporting North Korea, we will call you out on it", Haley said.
The solid-fuel missile that was launched was the second successful test of a missile that the USA calls KN-15, Martin reports.
Tillerson's comments reportedly came during a meeting with South Korea's newly appointed special envoy to the U.S., Hong Seok-hyun-one of four senior diplomats dispatched by newly elected President Moon Jae-in this week.