It added that the missile posed no threat to the US territory of Guam, which the North had previously warned it would fire missiles toward.
China's state-run news agency Xinhua said on Friday that Chinese warships carried out live fire drills in the western part of the Indian Ocean.
The missile test capped yet another eventful week on the Korean peninsula, which began with the annual US-South Korea military exercises.
India has, however, expressed concern over Chinese naval activity in the Indian Ocean.
North Korea fired 3 short-range ballistic missiles Saturday, August 26, the United States military said, reviving tensions with Washington after President Donald Trump had said Pyongyang was starting to show some "respect".
At 6:49 A.M. South Korea time, the first of three missile launches were detected.
Some of those flew more than 250 kilometers in a north-eastern direction, it added.
The presidential office in Seoul said the US and South Korean militaries will proceed with their war games "even more thoroughly" in response to the launch.
One appeared to have blown up nearly immediately while two flew about 250 km (155 miles) in the Northeastern direction.
North Korea's large-sized artillery rockets blur the boundaries between artillery systems and ballistic missiles because they create their own thrust and are guided during delivery, Kim said.
"We will continue to work with our interagency partners on a more detailed assessment of this latest launch and we will provide a public update if warranted", command spokesman Cmdr.
North Korean state-run media said the country's military could strike the U.S. at any time and that neither Guam, Hawaii nor the USA mainland could avoid the "merciless strike".
And then two more were fired within the next half an hour.
In this undated photo distributed Wednesday, Aug. 23, 2017, by the North Korean government, leader Kim Jong Un, center, visits the Chemical Material Institute of Academy of Defense Science at an undisclosed location in North Korea.
The statement said: "We solemnly warn not only the USA and the puppet group but also satellites, including the United Kingdom and Australia, which are taking advantage of the present war manoeuvres against the North, that they would face a miserable end if they join in".