But he also said the missile launch was hard to understand because North Korea benefits from the USA and China being at odds with one another.
Japan strongly denounced the launch, with Chief Cabinet Secretary Yoshihide Suga calling it "extremely problematic".
But Wednesday's missile did not appear to fly very far, only about 40 miles, after being launched at 6:40 a.m. Seoul time, South Korean military officials said.
Japanese and South Korean officials said they are still trying to find the details of the missile.
North Korea fired a ballistic missile off its eastern coast Wednesday morning, the fourth missile test this year and only two days before its closest ally China holds its first summit with U.S. President Donald Trump.
The latest North Korean missile test Wednesday, launched near the country's submarine base in Sinpo, could indicate the military is developing counter measures to defend against the threat of a USA preemptive strike and to nullify the advantage of the THAAD missile defense system being deployed in the South. When conducting nuclear and missiles tests in recent years, it has cited what it calls increasing US military threats.
"The United States has spoken enough about North Korea".
The JCS, however, dismissed the possibility that the missile was a submarine-based ballistic one, saying it was launched from land-based site.
The greenback also remained under pressure from growing doubts over whether the Trump administration's economic proposals would boost the US economy and allow the Federal Reserve to tighten policy more aggressively.
The Wall Street Journal: The U.S. and China, Sniping in Public, Have Tried in Private to Lower the Volume - "The summit now offers a test of that strategy and a chance for the two leaders, if they choose to take it, to recalibrate relations and reduce the risk of flare-ups over trade, North Korea or the South China Sea".
Shortly after the missile launch Cheong Wa Dae convened a National Security Council meeting chaired by its chief Kim Kwan-jin.
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A man watches a TV news program showing a file footage of North Korean leader Kim Jong Un, at Seoul Train Station in Seoul, South Korea, Wednesday, April 5, 2017.
The rogue nation's latest missile launch also came during annual military drills between the United States and South Korea.
On Tuesday, North Korea managed to launch a ballistic missile off the coast of the Korean Peninsula, which fell into the Sea of Japan.
China is hesitant to take any action that could cause North Korea to collapse, experts say, because of the potential that it would unleash a flood of refugees and let loose weapons of mass destruction.
The idea that the USA could deprive Pyongyang of its "nuclear deterrent" through sanctions is "the wildest dream", it said.
"It can roll out of a tunnel and launch on short notice", Schuster told CNN.
Solid fuel is like an explosive jelly, less corrosive than liquid fuel, and it can be more easily stored in the rocket's fuel tank than the liquid alternative, which requires specially lined tanks.
It has used the anniversary in previous years to test-fire the intermediate-range Musudan ballistic missile and to launch long-range rockets to try to put satellites into orbit. "It should be concerning everyone because it will be improving the chance to use their offensive capabilities better".
Harvard's Park says he believes Pyongyang has kept "very large sums" in China that the regime can use to buy what it wants for its weapons programs.
Park is a founding member of the Worldwide Coalition to Stop Genocide in North Korea, which warned in a statement to DW that "Seoul will be sacrificed" if a first strike should go ahead.
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