Why did North Korea question South Korea’s hypersonic glide vehicle test?

Jang Chang-ha argued that the vehicle may not have achieved hypersonic flight because photos released by Seoul showed no visible soot on its exterior. South Korea rejected that reasoning, saying its advanced thermal-protection technology prevents soot from appearing during hypersonic flight.

What technologies did South Korea test during its hypersonic glide vehicle launch?

The launch tested super-high-temperature thermal-protection materials, guidance and control systems, and the vehicle’s ability to perform irregular maneuvers at low altitudes. South Korea said it plans to continue developing technologies involved in weaponizing the HGV.

How did South Korea’s hypersonic glide vehicle test affect inter-Korean tensions?

The test was publicly unveiled amid heightened tensions after a land mine exploded in the border area and injured three South Koreans. The disclosure represented a rare public announcement about the development of a key South Korean military asset.

Defense ministry refutes Pyongyang's claim questioning Seoul's test of hypersonic glide vehicle

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Summary

South Korea’s defense ministry refuted a North Korean claim questioning Seoul’s recent hypersonic glide vehicle test. North Korea’s missile chief argued that the vehicle’s lack of visible soot cast doubt on hypersonic flight, while Seoul said its advanced thermal-protection technology makes soot impossible during such flight. The military plans to further develop technologies for weaponizing the HGV amid rising inter-Korean tensions.

Key Facts

Jang Chang-ha, director-general of North Korea’s Missile Administration, based his criticism on photos released after South Korea’s test last Thursday.
Cheong Wa Dae said the test evaluated super-high-temperature thermal-protection materials, guidance and control systems, and irregular maneuverability at low altitudes.
South Korea publicly disclosed the development of the HGV in what was described as a rare disclosure of a key military asset.
The launch followed a recent border-area land mine explosion that injured three South Koreans.

By Yonhap

Published Oct 16, 2026 12:18 am KST

South Korea test-fires a hypersonic glide vehicle from the Agency for Defense Development for the first time on Oct. 8, in this photo provided by Cheong Wa Dae. Yonhap

South Korea's defense ministry on Thursday refuted a claim by North Korea's missile chief that questions Seoul's recent test launch of a hypersonic glide vehicle (HGV).

Earlier in the day, Jang Chang-ha, director-general of North Korea's Missile Administration, claimed that South Korea's test of the HGV may not have achieved hypersonic flight because its outside appearance was "not stained with any soot," according to the North's Korean Central News Agency.

Jang cited photos provided by South Korea after last Thursday's test, but Seoul's defense ministry countered by saying the vehicle has advanced thermal-protection technology and the visible appearance of "soot" is impossible during hypersonic flight.

South Korea's military "plans to further develop technologies involved in the weaponization process of the HGV," the ministry said.

In a rare public disclosure of the development of key military assets, Cheong Wa Dae unveiled South Korea's first test launch of the HGV.

The test came amid rising inter-Korean tensions following the recent explosion of a land mine in the border area that injured three South Koreans.

The launch was aimed at testing super-high temperature thermal protection materials, guidance and control systems, as well as irregular maneuverability at low altitudes, Cheong Wa Dae said at that time.

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