South Korea, China and Japan are known not only as three developed countries in Northeast Asia, but also as regional and global players. In fact, contradictions, conflicts, and cooperation demands for reciprocal progress have characterized the relations among these three countries. The state of this trilateral relations has influenced Northeast Asia’s peace, cooperation, and development processes, as well as Asia’s prospects. The shaky connection, on the other hand, could lead to disagreements on multilateral cooperation channels, particularly in critical areas, such as politics, diplomacy, security, and economics. The article approaches China - Japan - Korea relations from the perspective of history and international relations, thereby analyzing the current situation of this relationship in the first two decades of the 21st century, and at the same time assessing the achievements, limitations and forecast some prospects in the near future.