"With its Friday missile launch, Pyongyang wanted to give the impression that sanctions will not work".
The US flew four stealth fighter jets and two bombers over the Korean peninsula on Monday in a show of force after North Korea's latest nuclear and missile tests, a report said. The US military could not immediately confirm the latest flights.
Mattis said earlier this month, after Kim tested the hydrogen bomb, the United States will answer any threat from the North with a "massive military response, a response both effective and overwhelming".
Trump spoke on Saturday night with South Korea's President Moon Jae-in, pledging joint "steps to strengthen deterrence and defence capabilities and to maximise economic and diplomatic pressure on North Korea", according to the White House.
The North insists its weapons program is necessary for self-defense. Kim was also the first ambassador to Spain, with the North Korean Embassy opening in February 2014.
Efforts to tame the increasingly belligerent North are set to dominate US President Donald Trump's address to the UN General Assembly and his meetings with South Korean and Japanese leaders this week.
Diplomacy and dialogue will not work with North Korea and concerted pressure by the entire global community is essential to tackle the threats posed by North Korea, Abe wrote.
In remarks to reporters at the Pentagon, Mattis said USA and Japanese missile defenses have been ready to respond, but were not needed.
"We are continuing to train for situations that may arise", said Kimmel. "And so for those who have said and have been commenting about the lack of a military option, there is a military option".
It traveled 2,300 miles as it flew over Japan before landing in the northern Pacific Ocean.
In a statement, Foreign Affairs Secretary Alan Peter Cayetano urged North Korea to "cease its provocative and highly risky actions that threaten the peace, stability and security of the region".
Alarmed by North Korea's advancing weapons programs, many conservatives in South Korea have called for the reintroduction of USA tactical nuclear weapons in the South.
Rep. Dana Rohrabacher, R-Calif., said the USA should intercept such missile tests as a show of force.
What has North Korea said?
China and Russian Federation only agreed to the new United Nations sanctions after they were softened by the US.
US and Japanese officials said they could have targeted the missile but did not make the effort because it was not aimed at land.
The tests, reminded Japanese Prime Minister Shinzo Abe, violated UN Security Council resolutions. It has tested their Pukguksong-1 submarine-launched ballistic missile six times. US and South Korean officials have said the North imports some 4.5 million barrels of refined petroleum products and two million barrels of crude oil each year.
Pentagon spokesman Col. Rob Manning told reporters Friday that if the IRBM had been a direct threat to USA territory or its allies, "we would have taken appropriate action".
Seoul is within artillery range of North Korea, which is also believed to have a sizeable chemical and biological arsenal beyond nuclear and conventional weapons. He identifies the North Korean threat as unprecedented, serious and immediate.
U.S. Defense Secretary Jim Mattis hinted on Monday about the existence of military options on North Korea that might spare Seoul from a brutal counterattack but declined to say what kind of options he was talking about or whether they involved the use of lethal force.
"It's just a test so it's not worth it", Jeung said in a telephone interview.
"It's a big gamble to decide whether or not to do this", he told NPR.