https://lenta.ru/articles/2017/12/30/vizit/
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://echo.msk.ru/programs/beseda/2119648-echo/
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
http://www.finanz.ru/novosti/aktsii/banki-rf-na-grani-sistema-ispytyvaet-nebyvaly-stress-1012303927
https://www.gazeta.ru/business/2017/12/29/11572922.shtml
https://www.gazeta.ru/comments/2017/12/29_e_11573336.shtml
https://www.kommersant.ru/doc/3512408
https://www.kommersant.ru/doc/3512185