https://tyzhden.ua/%D0%A1%D0%B2%D1%96%D1%82/253450
https://www.nytimes.com/2021/10/25/us/politics/russia-cybersurveillance-biden.html
https://www.rosbalt.ru/blogs/2021/10/22/1927577.html
https://lansinginstitute.org/2021/10/12/russian-intelligence-focus-in-bulgaria/
https://www.kp.ru/daily/28335.5/4480309/
https://www.rosbalt.ru/blogs/2021/09/23/1922629.html
https://www.radiosvoboda.org/a/dopovid-oon-pro-prava-ludyny/31475103.html
http://www.kasparov.ru/material.php?id=614AC17983B54§ion_id=43452FA6D4743