By the early 1960s, why were the Soviet Union and Communist China were becoming estranged?

Question

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Mao Zedong wanted Soviet support for a Chinese Communist invasion of Taiwan, but the Soviet leadership was unwilling to provide it. This was one of the major reasons for the growing estrangement between the Soviet Union and Communist China. Additionally, ideological differences between the two nations also contributed to the growing rift. The Soviet Union was moving towards a more moderate stance, while Communist China was becoming more ideologically radical under Mao's leadership.

By the Early 1960s, Why Were the Soviet Union and Communist