Why did the Soviet Union and Yugoslavia split?

Artificially dividing and highlighting national characteristics and establishing autonomous regions, just like the establishment of vassal states in the Zhou Dynasty, many mines were laid in the later period. When the Soviet Union was just founded, some people in the Soviet Party opposed a high degree of autonomy and highlighted the national label. Russian thinker Alekseev also thought that this model would lead to disintegration (the result was fulfilled in 199 1). In addition, the Soviet bureaucracy was rampant, corruption was uncontrollable, people's livelihood was depressed, the planned economy was stagnant, and the interior was completely decadent. External forces took the opportunity to interfere in the Soviet Union.