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North Korea Conducts Upgraded Solid‑Fuel ICBM Engine Test It Claims Can Reach U.S. Mainland
North Korea’s state media said leader Kim Jong Un observed ground tests of an upgraded solid‑fuel rocket engine—made with carbon‑fiber composite materials and rated at about 2,500 kilonewtons of thrust—which Pyongyang framed as part of a five‑year drive to field “strategic strike” weapons capable of reaching the U.S. mainland. South Korean analysts, including Lee Choon Geun, caution Pyongyang withheld key technical data (such as total combustion time), may be exaggerating progress, and still faces major technical hurdles—particularly confirmed flight tests and reliable warhead reentry—before a deployable solid‑fuel ICBM or multiwarhead system is proven.
📌 Key Facts
- North Korea’s state media (KCNA) said it tested an upgraded solid‑fuel ICBM engine made with composite carbon‑fiber materials, calling it part of a five‑year arms buildup to upgrade its 'strategic strike means' and explicitly tying the upgrade to weapons 'capable of reaching the U.S. mainland.'
- KCNA and reporting cite the upgraded engine’s maximum thrust as 2,500 kilonewtons, up from about 1,970 kilonewtons reported in a similar test last September.
- Kim Jong Un personally observed the ground jet/engine test and described it as a development of 'great significance' for putting the country’s strategic military capabilities at the highest level.
- Outside experts, including South Korean analyst Lee Choon Geun, caution Pyongyang may be exaggerating: North Korea did not disclose key parameters (notably total combustion time), has not yet flight‑tested an ICBM with the touted solid‑fuel engine, and could be facing delays or seeking a more advanced engine—possibly with outside (e.g., Russian) assistance.
- Some foreign analysts say significant technical hurdles remain—most importantly whether a warhead can reliably survive atmospheric reentry—while others argue the long‑running program may already have solved some challenges; previous North Korean multiwarhead claims (e.g., 2024) are disputed.
- Reporting links the engine‑power push to efforts to field smaller ICBMs and potentially multiple warheads and to broader doctrine shifts: analysts say North Korea is adapting combined‑arms tactics based on recent conflicts.
- State coverage also said Kim inspected special‑operations training and a new main battle tank whose protection system he claimed can defeat nearly all existing anti‑tank weapons; those equipment claims cannot be independently verified.
📰 Source Timeline (4)
Follow how coverage of this story developed over time
March 29, 2026
10:04 PM
North Korea conducts engine test for missile capable of reaching U.S. mainland
New information:
- KCNA now pegs the upgraded solid‑fuel engine’s maximum thrust at 2,500 kilonewtons, up from about 1,970 kilonewtons reported in a similar test in September.
- The engine uses a composite carbon‑fiber material and is explicitly framed by North Korea as part of a five‑year arms buildup to upgrade 'strategic strike means'—its term for nuclear‑capable ballistic missiles and related systems.
- Kim Jong Un personally observed the ground jet test and called it a development of 'great significance' for putting the country’s 'strategic military muscle on the highest level.'
- South Korean analyst Lee Choon Geun publicly cautions that Pyongyang may be 'bluffing,' noting the regime did not disclose total combustion time and has not yet flight‑tested an ICBM with the previously touted solid‑fuel engine, suggesting delays or a push for an even more advanced engine, possibly with Russian help.
- The article reiterates that some foreign experts believe North Korea still faces key technical hurdles such as reliable atmospheric reentry of a warhead, while others argue the long-running program may already have solved them.
12:28 PM
North Korea tests missile that it claims can target U.S. mainland
New information:
- KCNA now specifies the upgraded solid‑fuel engine’s maximum thrust as 2,500 kilonewtons, up from 1,970 kilonewtons reported in a similar test last September.
- KCNA and CBS frame the engine as for 'weapons capable of reaching the U.S. mainland,' explicitly tying the upgrade to that target set rather than just generic 'strategic strike' capability.
- Expert Lee Choon Geun notes that North Korea may be 'bluffing' because it did not disclose key parameters like total combustion time and suggests the program could be facing delays or seeking a better engine, potentially with Russian assistance.
- The piece reiterates that this test is part of a five‑year arms build‑up to upgrade 'strategic strike means' and emphasizes the use of composite carbon fiber in the solid-fuel engine.
- The article connects the engine‑power push to North Korean efforts to field smaller ICBMs and potentially multiple warheads, while noting doubts over North Korea’s claimed 2024 multiwarhead test and ongoing questions about warhead reentry survivability.
11:28 AM
North Korea tests solid-fuel missile engine as Kim boosts threat to US mainland
New information:
- Fox report reiterates that North Korea claims the engine is built with carbon-fiber composite materials and is part of a new five-year defense plan to upgrade ‘strategic strike’ capabilities.
- Expert Lee Choon Geun is quoted warning that Pyongyang’s thrust claims may involve ‘bluffing’ because total combustion time and other key parameters were not disclosed.
- Article adds more explicit caveats that North Korea still faces major technical barriers to fielding a fully reliable ICBM, particularly ensuring a warhead can survive atmospheric reentry.
- Fox notes Kim also inspected special-operations training and a new main battle tank, and relays Kim’s claim that the tank’s protection system can defeat nearly all existing anti‑tank weapons, which Reuters says cannot be independently verified.
- The story connects the engine test and tank exercises to broader doctrine shifts, as analysts say North Korea is adapting its combined-arms tactics based on lessons from recent conflicts.