韩国与日本是隔海相望的近邻，又同为美国的盟友，但长期以来两国之间的安全合作徘徊不前。历史积怨、岛屿争端等导致韩日两国政治互信不足，韩国政府迫于国内民众反日情绪在韩日安全合作上也十分谨慎。朝核问题的出现改变了东北亚地区的安全态势，韩日两国都视朝核问题为威胁，在共同应对朝鲜核威胁、维护地区和平与稳定方面，两国之间拥有广泛的共同利益。朝核问题也因此成为两国打破安全合作困局的契机，而该问题的持续发酵也成为两国在安全领域开展合作的重要动力。
In spite of the fact that South Korea and Japan are as much neighbouring countries across the sea as allies to the US，for long the security cooperation between them has been stagnant.The lack of sufficient political trust has its roots traced back to historical differences and island disputes.By the same token，the Korean government has been cautious in carrying out security cooperation with Japan due to the strong presence of anti-Japan sentiments domestically.The emergence of nuclear threat from North Korea has changed the security balance in Northeast Asia，where this threat is perceived acutely by both South Korea and Japan，as they share wide interests in terms of responding to the nuclear threat from North Korea and maintaining peace and stability in the region.Henceforth，the Korean nuclear issue has become an opportunity for both countries to bring down the barriers in security cooperation.The continuing development of this issue equally has become an important force to drive both countries to carry out cooperation in security.
