I found this lately, and I really had to talk about it, as the unchecked pontifications of this site are giving insecure Russian nationalists metaphorical "pats on the back" so they can elevate their feelings of self worth by glorifying their nationality.
Broadly speaking, this site hosts an impressive collection of Soviet-era documents and other materials. If this was the only thing this site was up to, I wouldnt be writing this. I am certainly in favor of USSR related media being archived and easily accessable. What you need to consider, however, is that this material is purely historial in nature. It is not gospel, it is not some grand revelation of truth. Anyone who has ever read into Roman history knows not to take Roman words on the Roman Empire at face value. Inflations and falsehoods are baked into documents written by countries about themselves, and the institutional scrutiny needed to avoid this was not present in the Roman empire. Likewise with the Soviet Union. I have publications first hand in my possession, digital and physical, from the Soviet Union, and I will tell you that the USSR is about as institutionally trustworthy as any other historical ideologically driven empire.
I will update this page with more analysis on this Russian site as I go through their claims. The general nature of the site is to take a claim as fact first, then work backward to try and justify it. The two claims this site works with are: "USSR good", and "Ukraine bad". It is pretty typically of a Russian to know jack shit about their own country, the USSR, and the actual origins of Russia for that matter, instead prefferring a glorified mystical narrative that sounds as if it came from a story book. Of course, these Russians cannot stop quoting historical literary works of fiction, or figurative poems, and using them as if they were historic sources themselves, which is exactly what this Golden-Horde resident loves to do on this site. He has been at it for a while too, with articles dating back to the early 2000s.