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://politeka.net/reading/561811-natsbezpeka-ukrayini-peremogi-porazki-ta-stsenariyi-na-2018-rik/
http://intersectionproject.eu/ru/article/russia-europe/kak-vengriya-vybiraet-s-kem-druzhit
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
https://www.kommersant.ru/doc/3511567
https://www.kommersant.ru/doc/3512383
http://hvylya.net/analytics/politics/chomu-kreml-pogodivsya-na-obmin-polonenimi.html
https://ru.krymr.com/a/28944363.html
https://www.radiosvoboda.org/a/donbass-real/28944163.html