Sources/proof in case anyone needs it (part in Russian, need Google Translate):
https://www.bellingcat.com/news/uk-and-europe/2021/02/11/vladimir-kara-murza-tailed-by-members-of-fsb-squad-prior-to-suspected-poisonings/
https://www3.kasparov.ru/material.php?id=532700145FBCA
https://maidan.org.ua//static/mai/1175078232.html
https://web.archive.org/web/20150621064119/http://soratnik.com/rp/1/1_8.html
