Kim Jong Un personally observed a ground‑jet test of a newly upgraded solid-fuel engine on 29 March 2026 . The engine, built with composite carbon‑fibre material , delivered a maximum thrust of 2,500 kilotons , surpassing the 1,971‑kiloton test in September 2025. Key Developments Test conducted under North Korea’s five‑year military escalation programme aimed at upgrading “strategic strike means”. Increase in thrust suggests intent to mount multiple warheads on a single missile, enhancing penetration of U.S. missile defences. State media ( KCNA ) highlighted the test’s “great significance” for the country’s strategic military muscle. Kim reiterated North Korea’s commitment to cement its status as a nuclear power and accused the United States of “state terrorism and aggression”. Important Facts The thrust increase aligns with a broader shift from older liquid‑fuel missiles, which require pre‑launch fueling and have limited endurance, to solid‑propellant systems that are quicker to launch and harder to detect. Recent ICBM tests have demonstrated range capabilities sufficient to reach the continental United States. However, experts note persistent challenges such as ensuring warhead survivability during re‑entry , a critical step for a functional ICBM. UPSC Relevance Understanding North Korea’s missile advancements is essential for GS III (Defence & Security) and GS II (International Relations). The test reflects: Strategic signalling in the nuclear‑armed states’ deterrence calculus. Implications for regional security architecture in East Asia, especially for India’s Indo‑Pacific strategy. Technological diffusion of solid‑propellant technology, relevant to questions on indigenous defence R&D. Way Forward Policymakers must monitor the evolution of North Korea’s ICBM programme, engage in multilateral diplomatic channels, and strengthen missi