https://www.gazeta.ru/comments/2017/12/28_a_11561696.shtml
A KGB manual showed how valuable—and how treacherous—Russian émigrés could be. Did KGB veteran Vladimir Putin learn those lessons?
https://www.thedailybeast.com/the-kgb-playbook-for-turning-russians-worldwide-into-agents
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
http://www.kasparov.ru/material.php?id=5A462801E9835
https://ru.krymr.com/a/28944363.html
https://www.gazeta.ru/sport/2017/12/28/a_11564102.shtml
https://www.rbc.ru/newspaper/2017/12/28/5a44f8999a79471a2a53c2a4
https://ru.krymr.com/a/28941690.html
https://www.kommersant.ru/doc/3511813
http://www.kasparov.ru/material.php?id=5A4345BAAAA47