Photo: Andrey Korchagin from St. Petersburg, Russia | CC BY-SA 2.0 | Wikimedia Commons
North Korea Tests Upgraded Solid‑Fuel ICBM Engine It Claims Can Reach U.S. Mainland
North Korea’s state media reported it tested an upgraded solid‑fuel ICBM engine made with carbon‑fiber composite materials and rated at about 2,500 kilonewtons of thrust, saying the effort is part of a five‑year drive to field weapons that can reach the U.S. mainland. Outside experts warn Pyongyang did not disclose key parameters such as total burn time and still faces major technical hurdles — notably warhead reentry survivability — so its claims may be exaggerated or aimed at incremental progress (potentially with outside help) amid broader military upgrades and exercises.
📌 Key Facts
- State media (KCNA) reported North Korea tested an upgraded solid‑fuel ICBM engine with a maximum thrust of 2,500 kilonewtons, up from 1,970 kN reported in a similar test last September.
- Pyongyang says the new engine uses carbon‑fiber composite materials and is part of a five‑year push to upgrade its 'strategic strike' means — framing the upgrade as intended to field weapons capable of reaching the U.S. mainland.
- Officials and analysts link the engine test to broader military activity, noting Kim Jong Un also inspected special‑operations training and a new main battle tank, and tying these moves to doctrine shifts toward combined‑arms tactics informed by recent conflicts.
- North Korea claims the new tank’s protection system can defeat nearly all existing anti‑tank weapons; that assertion has not been independently verified (Reuters/Fox reporting).
- Analysts warn major technical barriers remain before Pyongyang can field a fully reliable ICBM, especially ensuring a warhead can survive atmospheric reentry and doubts about a previously claimed 2024 multiwarhead test persist.
- Expert Lee Choon Geun cautions North Korea may be 'bluffing' about performance because key parameters (for example total combustion time) were not disclosed; he suggests the program could be delayed or seeking a better engine, possibly with outside (e.g., Russian) assistance.
- Observers say the engine‑power push appears aimed at enabling smaller ICBM designs and potentially multiple warheads, but significant questions remain about technical feasibility and verification of North Korean claims.
📰 Source Timeline (3)
Follow how coverage of this story developed over time
March 29, 2026
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.