It said North Korean leader Kim Jong-un sent "warm congratulations" to the national defence scientific research units involved in the test-firing. "By displaying this a day after announcing plans for working-level talks, North Korea is implying that its weapons capacity will continue to be improved while negotiations are stalled".
The launch on Wednesday was the most provocative by North Korea since it resumed dialogue with the United States in 2018 and a reminder by Pyongyang of the weapons capability it had been aggressively developing, including intercontinental ballistic missiles, analysts said.
North Korea's introduction of the Pukguksong-3 submarine-launched ballistic missile is a grave moment for North East Asian regional security - and a reminder of what has been lost over almost two years of all-show-no-substance diplomacy.
Patrick Ryder told reporters there was no indication the missile on Wednesday was launched from a submarine, but declined to provide other details.
KCNA said the missile was launched in a vertical mode and that its test had no adverse impact on the security of neighboring countries.
North Korea's SLBM is a strategic weapon capable of carrying nuclear warheads and attacking the United States island territory of Guam, depending on the size of the submarine.
It identified the submarine-launched ballistic missile (SLBM) as a Pukkuksong-3.
UNITED NATIONS - Britain, France and Germany have called for a Security Council meeting on North Korea's recent ballistic missile launches, which are a violation of U.N. sanctions.
The test is seen as the North's most high-profile weapons launch since it began diplomacy with the United States early a year ago.
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"The delegates of the DPRK side are ready to enter into the DPRK-U.S. working-level negotiations", said Choe, referring to the abbreviation of North Korea's official name.
South Korea's Joint Chiefs of Staff said Wednesday that the missile, believed to be an SLBM, reached a height of around 565 miles and traveled around 280 miles before crashing into the sea.
The latest version of the Pukguksong may be the longest-range North Korean missile that uses solid fuel and the first nuclear-capable missile to be tested since November 2017, Ankit Panda of the US-based Federation of American Scientists said.
But North Korea followed the announcement by launching what appeared to be two ballistic missiles off its eastern coast yesterday, with Japan saying one may have landed in the waters of its exclusive economic zone (EEZ).
Moreover, submarine-launched missile trajectories could pose problems for missile defenses in both South Korea and Japan.
The two sides are expected to focus on finding common ground between US demands for the North's complete and verified denuclearization and Pyongyang's demands for sanctions relief and security guarantees.
The North Korean government issued a photo of what it said was an underwater-launched ballistic missile.
Negotiations between USA and North Korean diplomats have been frozen since the breakdown of a summit between Trump and Kim in Hanoi in February.