https://www.nytimes.com/2021/10/25/us/politics/russia-cybersurveillance-biden.html
https://www.bbc.com/russian/features-40340292
https://lansinginstitute.org/2021/10/12/russian-intelligence-focus-in-bulgaria/
https://www.kp.ru/daily/28335.5/4480309/
https://ua.krymr.com/a/vitaliy-portnykov-fsb-di-za-starymy-skhemamy-krym/31452143.html
https://www.kp.ru/daily/28311.5/4452347/
https://www.kommersant.ru/doc/4919615
https://newtimes.ru/articles/detail/204880?fcc