https://www.svoboda.org/a/31467728.html
http://www.kasparov.ru/material.php?id=6145D870191CC§ion_id=444F8A447242B
https://ru.krymr.com/a/vitaliy-portnikov-krym-putin-zelenskiy-rossiya-ukraina/31461752.html
https://jamestown.org/program/the-russian-elections-and-hidden-regionalist-politics/
http://region.expert/no-parties/