In other news, I'd highly recommend the book Gulag: A History by Anne Applebaum.
Meanwhile it is standard procedure to translate the names of Communist parties and use their abbreviations such as the CPSU, CPC (or CCP) and so on. The same is even true for other languages, e.g. in German the CCP is abbreviated KPCh and the CPSU is usually written as KPDSU.
Again, it's mostly Germany where this is not the case, since the Socialist Unity Party usually also just is abbreviated SED like in Germany.
As you mentioned, КПСС or KPSS would be of course in principle even ''more correct'', but since nobody would write that I think the answer should be simply CPSU.
If there were ever Soviet troops on Finnish territory without being invited there, then Finland was invaded.
irony since they got lost on GPS and by accident invaded Crimea again not that long ago :)
Although sadly today we're starting to have our freedoms infringed upon for the sake of a divisive media and oversensitive people who don't seem to understand the difference between hate speech and fact. Complacency will of course only help this problem.
easy but lots of fun