North Korean leader Kim Jong Un has overseen a test of a new rocket engine designed for intercontinental ballistic missiles (ICBMs) that he described as marking a “significant change in expanding and strengthening” the country’s strategic nuclear forces.

The country’s official Korean Central News Agency (KCNA) reported on Tuesday that the successful test marked the ninth and final ground test of the solid-fuel rocket engine, built with carbon fibre and capable of producing 1,971 kilonewtons of thrust – a measure of propulsive force which is more powerful than earlier North Korean rocket engines.

The KCNA said that Kim expressed satisfaction after Monday’s test, calling the “eye-opening” development of the new rocket engine a “significant change” in North Korean nuclear capabilities.

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