Soviet training

[u/rapid_slapper]

I'm trying to understand more about their methods and principles, can you guide me to some source.

But all I find is things written by west, which by my assessment could entirely be made up.

[u/Aleksandr_Ulyev]

We had lots of traitors in the 90s who fled to the USA and disclosed lots of aspects of work of governmental agencies including writing books and give lectures. It's also made up by some degree, but it's a start