USSR = Soviet Union = Union of Soviet Socialist Republics
now Russia = Russian Federation
in times of USSR Russia = RSFSR = Russian Soviet Federative Socialist Republic and was part of USSR
before USSR Russia = Russian Empire
Russia is the modern country name. It’s like France or Spain. The name of the country. Soviet Union and USSR is the same thing. (USSR = Union of Soviet Socialist Republics) That’s history. It was a union of 15 Socialist (note Not Communist) republics:
And that union was called USSR.
It broke up about 20 years ago and now all these nations run independently. One of those nations is Russia (Russian Federation).