South Korea has begun deploying its most powerful conventional ballistic missile, the Hyunmoo-5 – dubbed the “monster missile” for its massive warhead – to frontline units, military officials said on Sunday, a move that underscores Seoul’s effort to strengthen deterrence against North Korea. The ground-to-ground missile, capable of carrying a warhead of up to eight tonnes, began entering frontline units late last year and is expected to complete full operational deployment before the current...