http://www.ng.ru/news/593889.html
http://www.ej.ru/?a=note&id=31560
https://www.gazeta.ru/tech/2017/09/14/10888208/zakharova_kaspersky.shtml
Five arrests. Two years. The ultimate crime: spying for Russia. An exclusive investigation by BuzzFeed News and Re:Baltica reveals a new tactic in Russia’s spy wars.
http://www.iiss.org/en/regions/russia/belarus-and-zapad-2017-4042
http://www.politika.rs/scc/clanak/388772/Ko-ce-remontovati-migove-29-Srbi-ili-Rusi
https://www.radiosvoboda.org/a/28733768.html
http://www.kasparov.ru/material.php?id=59B8FC706372B
https://www.kommersant.ru/doc/3409158