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://politeka.net/reading/561811-natsbezpeka-ukrayini-peremogi-porazki-ta-stsenariyi-na-2018-rik/
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
http://www.kasparov.ru/material.php?id=5A462801E9835
http://www.rosbalt.ru/russia/2017/12/29/1672008.html
http://hvylya.net/analytics/politics/chomu-kreml-pogodivsya-na-obmin-polonenimi.html
https://www.radiosvoboda.org/a/donbass-real/28944163.html
https://www.segodnya.ua/regions/donetsk/donbass-2018-prognozy-perspektivy-i-riski-1101877.html