South Korea's blue-water expansion extends a navy that still has to operate in the peninsula's littoral waters. The fortified land border makes the sea a route around fixed defences, as the Incheon landings demonstrated during the Korean War. Wider naval reach helps block an opponent from exploiting that route while giving South Korea more defensive depth and power-projection options. It also protects the maritime trade on which major Korean exporters and the national economy depend. Destroyers, frigates, amphibious ships, and possible carrier aviation all answer those connected geographic and economic demands.
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Trade and strategic depth drive Korea's destroyer fleet
Blue-water destroyers extend South Korea's defensive depth beyond its fortified land border and protect the maritime trade that supports its economy.