North Korea said Tuesday it had conducted the final ground test of a solid-fuel rocket engine for a long-range ballistic missile in its latest advancement toward having an arsenal that could viably threaten the continental United States.

Axar.az reports, citing AP, the test Monday observed by leader Kim Jong Un was the ninth of the engine built with carbon fiber and capable of producing 1,971 kilonewtons of thrust, more powerful than past models, according to the North’s official Korean Central News Agency.

The report came a week after Kim visited the research institute that developed the engine, which North Korea then said will be used for future intercontinental ballistic missles, including a system called Hwasong-20.

Some analysts say that North Korea may conduct another ICBM test around the end of the year, showcasing its military strength ahead of a major ruling party congress expected in early 2026, where Kim will likely issue his new directions in domestic and foreign policies.