Hyunmoo-4/5

South Korea's most powerful indigenous ballistic missile series, developed for deep strike against hardened and underground targets — a critical requirement given North Korea's extensive tunnel and bunker network. The Hyunmoo-4 features a maximum range of approximately 800 km with a warhead reported at 2,000 kg, designed specifically for earth-penetrating bunker destruction. The Hyunmoo-5 is reported to carry an even heavier warhead — possibly 8,000-9,000 kg — at shorter range (300 km), earning it the nickname "monster missile" and making it the heaviest conventional warhead on any ballistic missile globally. Both use solid-fuel propulsion with inertial/GPS guidance. Development accelerated after the lifting of US-imposed range restrictions on Korean missiles in 2021. The Hyunmoo series is central to South Korea's "Kill Chain" pre-emptive strike doctrine and Korean Massive Punishment and Retaliation (KMPR) strategy against North Korea.