Why might you expect Japan the Koreas and China to have a closer relation?

Japan, the Koreas, and China share deep historical, cultural, and economic ties that could foster closer relations. Geographically, they are situated in East Asia, facilitating trade and cultural exchange. Additionally, all three face common challenges, such as regional security threats and economic competition, which could encourage collaboration. However, historical grievances and territorial disputes often complicate these relationships, making cooperation more complex.