https://www.inopressa.ru/article/26Nov2018/dailybeast/spy.html
https://www.kommersant.ru/doc/3804857
“Natural causes” can’t be ruled out. But those include stress, and there’s no doubt Gen. Korobov of the G(R)U was under a lot of that.
https://www.thedailybeast.com/inside-the-mystery-of-the-dead-russian-spy-chief
https://www.inopressa.ru/article/23Nov2018/handelsblatt/kaspersky.html
http://www.dsnews.ua/world/smert-nachalnika-gru-kak-putin-naryadilsya-v-nikolaya-i-22112018220000
https://www.depo.ua/ukr/svit/kinec-korobova-chomu-tak-chasto-ginut-putinski-shpiguni-20181122873929
Mis en cause dans l’affaire Skripal ou l’attaque des serveurs démocrates durant la campagne américaine, le renseignement russe montre ses faiblesses.
https://www.inopressa.ru/article/19Nov2018/lemonde/militaire.html