South Korea and Japan share an at times volatile post-war relationship. The dispute over the Dokdo/Takeshima islets remains a significant point of contention in the strained South Korea–Japan relationship. The issue most recently came to a head during the Tokyo 2020 Olympics.
The dispute over the rocky outcrops, located roughly halfway between the two nations, has significant economic implications as both nations claim sovereignty over the area and its associated Exclusive Economic Zone. Despite having hardly any usable landmass, both states attach deep sentiments to the islets due to post-war turmoil and historically charged wounds.
Japan and South Korea’s battle over Dokdo/Takeshima at the Olympics (eastasiaforum.org)