This paper is to assess North Korea’s anti access and area denial (A2AD) threat and capability to provide insights on how they would affect the transformation for ROK naval force projection. A2AD is an attempt to deny an enemy’s freedom of maneuver on the battlefield. When thinking of the operational concept of A2AD, we think of regional powers like Russia and China that have modern technology to uphold A2AD. This modern technology includes advanced aircraft, warships and specialized ballistic and cruise missiles. Considering the close military ties that North Korea has with Russia and China, this modern technology must have been proliferated to enhance the A2AD capability of North Korea. The reason North Korea develops A2AD capability has to do with its wartime strategy. To destroy the U.S.’s force flow from the mainland of the U.S., it is essential for North Korea to strengthen A2AD capability. To ensure force-projection against North Korea’s A2AD strategy, the following considerations should be made. First, the ROK-U.S. alliance has to share common future strategies, doctrines and action plans for Joint All Domain Operations (JADO). Second, as the U.S. Navy and Marine Corps transform their strategy to contribute to the joint operation, the ROK Navy and Marine Corps have to rethink their future strategy so that they can perform new combined operations responding to the A2AD strategy of North Korea. Third, the Ministry of National Defense (MND) should revise its military reform plans to meet the JADO requirement. Finally, the ROK government should consider participating in minilateralism led by the U.S.