A revived trilateral

Japan and South Korea are shoring up security

Last week, in an unprecedented trilateral summit at the American presidential retreat of Camp David, the leaders of Japan and South Korea agreed to deepen their cooperation with the United States. The importance of this agreement cannot be overstated. For a considerable time, action to control Beijing’s ambitions to its east was being held back by disunity between Seoul and Tokyo. This distrust stemmed from the still-open wounds of history: The Japanese occupation of the Korean peninsula and its wartime record were viewed very differently by political forces in the two countries. Earlier this year, however, South Korean President Yoon