North Korea is likely spending their limited resources on what is a prestige project instead of a real military capability for them. As Iranian found out, the U.S. military will sink the North Korean navy very quickly during any conflict:

North Korean leader Kim Jong-un has overseen a test-firing of strategic cruise missiles from a new destroyer ahead of its commissioning, noting that equipping the navy with nuclear weapons is making “satisfactory progress,” state media reported Thursday.
Kim inspected the Choe Hyon at a shipyard in the western port city of Nampho on Tuesday and Wednesday to review its crew members’ combat training and assess its operational capabilities, according to the Korean Central News Agency (KCNA).
Kim oversaw the launch of sea-to-surface strategic cruise missiles from the destroyer Wednesday, assessing the test as a “core” element of the warship’s operational capabilities.
North Korea’s reference to “strategic” weapons suggests that they could have nuclear capabilities.
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