I want to know the answer to the following question:
How long did the Soviet Union retain a hegemonic role?
All the background I'm provided with is that "The Russian Empire used Pan-Slavism as a political tool; as did the Soviet Union, which gained political-military influence and control over most Slavic-majority nations between 1945 and 1948 and retained a hegemonic role until the period 1989–1991.". Is that enough to answer the question?
Answer: yes