https://www.gazeta.ru/business/2017/12/30/11583752.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.radiosvoboda.org/a/28945900.html
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
http://www.rosbalt.ru/russia/2017/12/29/1672008.html
https://ru.krymr.com/a/28944363.html
https://www.kommersant.ru/doc/3511804
https://ru.krymr.com/a/28941690.html
https://www.kommersant.ru/doc/3511813
https://www.gazeta.ru/comments/column/desnitsky/11508710.shtml