https://lenta.ru/articles/2017/12/30/vizit/
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/28945769.html
https://www.kommersant.ru/doc/3512349
https://www.kommersant.ru/doc/3512350
https://www.inopressa.ru/article/29Dec2017/dailybeast/kgb.html
https://ru.krymr.com/a/28943727.html
https://ru.krymr.com/a/28944034.html