1, system rigidity 2, reform failure 3, leadership dereliction of duty 4, peaceful evolution 5, arms race 6, ethnic problems 7, inner-party corruption My point is that the disintegration of the Soviet Union objectively declared the bankruptcy of Leninism, that is, it declared that Lenin's assertion that "socialism can win first in one country" was wrong, and it also declared that Lenin bankrupt the organizational form of democratic centralism. Only these two ideological pillars of Leninism have been realized. Socialism cannot win first in one country and several countries. Historical practice has proved that Leninism is radical communism and an "ultra-left" thought that transcends the objective reality of world development and runs counter to Marxism. Russia has no objective conditions for socialist experiments, underdeveloped material foundation, low level of productivity, low cultural quality of the people and no communist consciousness. On this basis, the result of rashly carrying out socialist experiments can only be failure. This is the fundamental reason for the disintegration of the Soviet Union and the disintegration of the Soviet Union.