The Biden administration pursues an “alliance first” foreign policy while strengthening the implementation of the “Indo-Pacific Strategy”. On this basis，the consolidation of the trilateral relations between the United States，Japan and ROK has also become its strategic pillar in Northeast Asia. In order to further maintain its strategic advantage with China and maintain deterrence against DPRK，the Biden administration has strengthened the trilateral security relationship between the United States，Japan and the Republic of Korea，which has become an important part of deepening its East Asian alliance system. To this end，the DPRK has also prepared for long-term confrontation with the United States，Japan and ROK，and is striving to improve its national defense capabilities. With the deepening of the trilateral security relationship between the United States，Japan and ROK，and the continuation of the Ukraine crisis，the formation of Northeast Asia’s campization has gradually emerged. The possibility of crisis in Northeast Asia has greatly increased.