http://www.ng.ru/economics/2019-12-24/1_7760_income.html
SOFIA, Bulgaria -- The Russian assassin used an alias, Sergei Fedotov, and slipped into Bulgaria unnoticed, checking into a hotel in Sofia near the office of a local arms manufacturer who had been selling ammunition to Ukraine.He led a team of three men.Within days, one man sneaked into a locked parking
https://news.yahoo.com/poisoning-bulgaria-exposed-russian-assassins-133100185.html
https://www.inopressa.ru/article/23Dec2019/nytimes/gebrev.html
http://www.ng.ru/economics/2019-12-23/1_7759_levada.html
https://www.kommersant.ru/doc/4205196
https://www.nytimes.com/2019/12/22/world/europe/bulgaria-russia-assassination-squad.html
http://www.ng.ru/economics/2019-12-22/1_7758_taxes.html
https://lenta.ru/articles/2019/12/21/bunt/
http://www.kasparov.ru/material.php?id=5DFE0422C7E1C