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://echo.msk.ru/programs/beseda/2119648-echo/
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
https://theins.ru/politika/86416
http://hvylya.net/analytics/politics/chomu-kreml-pogodivsya-na-obmin-polonenimi.html
https://nv.ua/opinion/tsaplienko/ob-odnom-osvobozhdennom-naemnike-2442492.html
http://www.kasparov.ru/material.php?id=5A4516997A61D
https://www.gazeta.ru/politics/2017/12/27_a_11555930.shtml