FILE PHOTO: A view of what state news agency KCNA reports is the test firing of a hypersonic missile at an undisclosed location in North Korea, January 5, 2022, in this photo released January 6, 2022 by North Korea's Korean Central News Agency (KCNA). KCNA via REUTERS
SEOUL (Reuters) - North Korea's recent claims of testing hypersonic weapons overshadowed its pursuit of a potentially risky rocket fuel system that analysts say could allow the nuclear-armed state to deploy and launch its missiles faster during a war.
Most of the country's largest ballistic missiles use liquid fuel, which typically requires them to be loaded with propellant at their launch site before they can be fired - a time-consuming step that makes them easier to spot and destroy.
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