U.S. Gen. Terrence O'Shaughnessy, commander of Pacific Air Forces, said, "North Korea's actions are a threat to our allies, partners and homeland, and their destabilizing actions will be met accordingly".
Pyongyang's official Korean Central News Agency said it was a Hwasong-12 intermediate range missile that the North first successfully tested in May and threatened to fire into waters near Guam earlier this month.
It came hours after North Korea claimed that its leader has inspected the loading of a hydrogen bomb into a new intercontinental ballistic missile.
Earlier in August, Pyongyang threatened to launch four missiles near the United States Pacific Guam island, as Trump warned that Pyongyang would face "fire and fury" if it carries action that threatens the U.S. and its allies.
If the initial data holds, it would make it the most powerful weapon North Korea has ever tested.
Tokyo and London also pledged to work with the worldwide community to strictly implement the United Nations Security Council's sanctions on North Korea with a view to bring about its denuclearization, according to the statement.
Kim has launched more missiles this year than his dad did in his entire 17-year reign of North Korea.
North Korea "categorically rejects the "presidential statement" of the UNSC that flagrantly violated the right to self-defense of a sovereign state", the spokesman was quoted as saying by the KCNA.
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North Korea has been under United Nations sanctions since 2006 over its ballistic missile and nuclear programmes.
The authorities in North Korea are highly nationalistic and promote resentment of the U.S. and Japan as part of their claim to legitimacy. Last year, North Korea conducted two nuclear-bomb tests.
Both leaders spoke on the phone on Friday about North Korea's "continued destabilising and escalatory behaviour" and agreed to strengthen their alliance through defence cooperation and South Korea's defence capabilities, the White House said in a statement.
Trump and South Korean President Moon Jae-in said on Saturday they plan to revise a 43-year-old joint treaty that caps the number and range of South's ballistic missiles.
South Korea's Joint Chiefs of Staff said in a statement that the military had "detected a man-made quake near Punggye-ri and is analyzing whether it was a nuclear test".
History reveals that USA has been at war with North since the 1950-53 conflict that ended up in a truce rather than peace treaty.
Asked about her comments, Chinese Foreign Ministry spokeswoman Hua Chunying said that some "relevant sides", when it comes to sanctions, "storm to the front, but when it comes to pushing for peace they hide at the very back".
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