https://www.kommersant.ru/doc/3760270
https://www.thetimes.co.uk/article/two-failures-and-moscow-is-seeing-red-pbkdlhwvr
https://www.kommersant.ru/doc/3760230
http://www.kasparov.ru/material.php?id=5BB64607D526E
https://www.inopressa.ru/article/04Oct2018/buzzfeed/poteyev.html
The Kremlin wanted people to believe their defector was dead. The US did, too. But Alexander Poteyev couldn’t help himself.
http://www.kasparov.ru/material.php?id=5BB480D6E13CC
https://day.kyiv.ua/ru/blog/politika/yavlenie-anatoliya-chepigi
https://ru.krymr.com/a/arkadiy-babchenko-o-rassledovanii-svoego-ubiystva/29521019.html
http://www.kasparov.ru/material.php?id=5BB34795D03B4