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But the South Korean military said the North is exaggerating the success of the test and its overall missile prowess.

The report by North Korean state media came a day after the South Korean and Japanese militaries detected from near the North's capital toward its eastern sea.

State media said the test was supervised by , who described the Hwasong-16B missile as a key piece of his nuclear deterrent he vowed to further build up to counter his “enemies,” a reference to the United States, South Korea and Japan.

In recent years, North Korea has been developing more missiles with built-in solid propellants. Such weapons are easier to move and hide, and can be launched quicker than liquid-propellant missiles, which need to be fueled before launch and cannot stay fueled for long periods of time.

North Korea tested a for the first time last year, adding to its arsenal of long-range weapons targeting the U.S. mainland. The country also has an extensive lineup of short-range and mid-range solid-fuel missiles that can be fired from land vehicles, ships and submarines and are potentially capable of hitting targets throughout South Korea and Japan. In recent months, the North demonstrated some of these missiles in drills it described as simulated nuclear strikes.

Since 2021, it's also been testing designed to fly at more than five times the speed of sound. If perfected, such systems could potentially pose a challenge to regional missile defense systems because of their speed and maneuverability. However, it’s unclear whether these missiles are consistently flying at the speeds the North claims.

North Korean official media KCNA claimed that during the Tuesday test, the missile’s hypersonic glide warhead reached a peak altitude of 101 kilometers (62 miles) and flew about 1,000 kilometers (621 miles) after separating from the launch rocket, and performed various maneuvers before landing in waters between the Korean Peninsula and Japan.

South Korea’s Joint Chiefs of Staff on Wednesday maintained its assessment that the missile flew about 600 kilometers (372 miles) and accused North Korea of exaggerating the missile’s flight performance, although acknowledging that the North’s technologies were improving. The previous day, Japan reported a similar flight distance, although its Defense Ministry reported a maximum height close to that claimed by the North.

The Joint Chiefs of Staff said it remains unclear whether the North has perfected the technologies to ensure that the warheads of its hypersonic solid-fuel missiles and intercontinental ballistic missiles survive the harsh conditions of atmospheric re-entry.

“Hypersonic missiles are weapons systems that are still being developed by advanced nations (the United States, China and Russia etc.) and they require highly difficult technologies,” the Joint Chiefs of Staff said in a text message to reporters. “It’s difficult to predict when they will be deployed operationally, but it’s expected to take a considerable amount of time.”

The North years after it flight-tested liquid-fuel IRBMs. Experts say such weapons if perfected is potentially capable of reaching remote U.S. targets in the Pacific.

“North Korea’s development of hypersonic IRBMs targets Guam, which hosts U.S. military bases, and even Alaska,” said Chang Young-keun, a missile expert at South Korea’s Research Institute for ��ɫtv Strategy.

Kim Dong-yub, a professor at the University of North Korean Studies in Seoul, said the missile tested on Tuesday was likely different from the system tested in January, which state media didn't name but was likely the Hwasong-16A.

North Korea in previous tests have unveiled two different types of hypersonic vehicles – a conical one and a wedge-shaped one. State media images show that the January launch involved a conical warhead while the wedge-shaped design was used for Tuesday’s launch.

Tensions in the region have risen since 2022 as Kim used Russia’s invasion of Ukraine as a distraction to accelerate his testing of missiles and other weapons. The United States and South Korea have responded by expanding their combined training and trilateral drills involving Japan and sharpening their deterrence strategies built around strategic U.S. assets.

Hours after the launch, Seoul’s Defense Ministry announced that South Korea, the United States and Japan conducted a combined aerial exercise above waters near South Korea’s Jeju island that involved at least one nuclear-capable U.S. B-52 bomber.

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AP writer Hyung-jin Kim contributed to this report.