http://www.rosbalt.ru/blogs/2017/04/20/1609429.html
http://www.kommersant.ru/doc/3275949
https://www.gazeta.ru/business/2017/04/20/10636049.shtml
By all appearances, Russian President Vladimir Putin is at the height of his power. Why then such concern over protests by a political leader who appears to be so fully in control?
https://www.foreignaffairs.com/articles/russian-federation/2017-04-19/why-protests-keep-putin-night
https://www.vedomosti.ru/opinion/columns/2017/04/19/686321-zachem-tserkov
http://www.kommersant.ru/doc/3275940
http://www.kasparov.ru/material.php?id=58F70F0277722
http://www.kasparov.ru/material.php?id=58F678C944F5E
http://carnegie.ru/2017/04/19/ru-pub-68732
http://www.kasparov.ru/material.php?id=58F7920F71811