On a side-note, while I partially agree with the gist of what you say re Russian mentality of ‘asking for papers because just they can make you comply’ (though that comment isn’t really relevant to what I wrote) - it’s worth mentioning that I spent 3 years living and working in Russia. On not one single occasion (and this includes travelling the entire length of the country from Moscow to Vladivostok both by train, many times, and once by car) was I ever stopped by the police / law enforcement or asked to show my papers or passport, except when entering or exiting the country at an airport or international border.
Nor was this because I’m obviously a ‘foreigner’ in Russia and was treated differently for that reason - I’m not sure anyone could tell I’m not Russian just by looking at me, and I can speak good enough Russian not to need to communicate in English when I’m travelling there.
Not sure I can say the same about the last 3 years I was continuously in the US.... ;)
I have read that folks from the Caucasus get the third degree, and it's clear they (whether Georgian, Ossetian or Chechen) have a distinct look about them, ranging from the unibrow and the 5 o'clock shadow at noon which are visible and the hairy backs, which (generally) isn't.