South Korea announced Thursday it will not renew its bilateral military information-sharing pact with Japan, known as the General Security of Military Information Agreement, or GSOMIA. Amid ongoing South Korea-Japan trade disputes and North Korea’s latest wave of short-range missile tests, this decision heightens regional tensions, undermining not only South Korea’s national security interests but also America’s and Japan’s.South Korea and Japan signed the GSOMIA in November 2016 to provide both countries with a direct line of communication for the exchange of classified military information regarding both North Korea’s ballistic missile launches and conventional military operations. South Korea’s satellite intelligence, after all, is limited to domains south of the military demarcation line. By contrast, Japan’s Self-Defense Forces have several intelligence satellites monitoring North Korean activity north of the military demarcation line. The GSOMIA thus fills intelligence gaps that both countries have.