/u/Kochevnik81 has written a lot about nationality policy in the USSR, e.g.

• Did people living in the Soviet Union consider themselves Russian?

• How autonomous were the Soviet republics?

• Did Soviet Ethnologists Really Create Uzbeks, Kazakhs, Turkmen and Other Central Asian Ethnicities? How did they Determine who was Who? feat. Gasmaskedmook, who will be pinged in the next comment

• It's the 25th of December 1991 - I am a Soviet enlistedman, my buddy is a political officer (commissar?), and my boss is a very high-ranking officer. We're stationed in a non-Russian city (Kiev, or Nur-Sultan), but all from different areas of the Union. What happens tomorrow, as the nation dissolves?

/u/kaiser_matias has previously answered

• What examples are there of the USSR pitting different ethnicities against each other?

• Was there a 'glass ceiling' for a budding a Georgian, Tatar, or other non-Russian Soviet official? Was any special treatment granted to different SSR depending on the nationality of the person in charge?

• The Soviet Union had various programs and policies intending to protect and promote minority ethnic and culture groups. Did they work? Or was there also de facto or de jure Russification happening at the same time, particularly in the East? (be sure to scroll down and read the follow-up answers at this link)

/u/Jon_Beveryman has previously answered What was the conscription process for the USSR recruiting Central Asian men to fight in WW2?

I have run out of pings, see below. You might want to read the now-anonymous answer to another version of your question.