https://jamestown.org/program/clashes-intensify-between-moscow-and-circassians-on-key-issues/
https://ua.krymr.com/a/vitaliy-portnykov-fsb-di-za-starymy-skhemamy-krym/31452143.html
https://www.bbc.com/russian/features-57969809
https://www.ng.ru/economics/2021-07-22/1_8204_economics1.html