Nikolai Glushkov, a close associate of the late oligarch Boris Berezovsky, was preparing to testify that Aeroflot was a corrupt instrument of Russian intelligence. Then, on the eve of his court date, he was strangled to death with a dog leash.
http://www.kasparov.ru/material.php?id=5BBDE57B5BEF5
http://www.kasparov.ru/material.php?id=5BBBB8B919217
https://www.radiosvoboda.org/a/29530413.html
«Отравителем» Петровым оказался военный врач из ГРУ Александр Мишкин
https://www.gazeta.ru/social/2018/10/08/12013585.shtml
https://www.novayagazeta.ru/articles/2018/10/07/78100-12-let-so-dnya-ubiystva-anny-politkovskoy
https://www.thetimes.co.uk/article/two-failures-and-moscow-is-seeing-red-pbkdlhwvr
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.