It was quite common "back in the day" to call what was properly "the Soviet Union" just "Russia". And it wasn't just pure sloppiness, either; the Soviet Union and its predecessor Russian Empire both had Russia as their heart and soul.
Also, everything in this article has been well known for ages. No need to hold back your trust. It's a nice writeup though!
https://deportetie.kartes.lv is but one illustration of Soviet != Russia for history buffs. An empire's heart and soul is usually black ice. The USSR was not an exception.
Also, everything in this article has been well known for ages. No need to hold back your trust. It's a nice writeup though!