Tougher sanctions will only make him double down on antagonizing the West.
https://www.theatlantic.com/international/archive/2018/08/russia-sanctions-putin-approval/568228/
https://www.bloomberg.com/view/articles/2018-08-23/trump-sanctions-can-t-bring-russia-to-its-knees
https://ru.krymr.com/a/rossiyskiy-vnutrisetevoy-rouming-v-krymu/29448939.html
http://www.ng.ru/economics/2018-08-23/4_7295_agression.html
https://www.gazeta.ru/business/2018/08/23/11919823.shtml
http://www.kasparov.ru/material.php?id=5B7E4EA05C423
http://expert.ru/expert/2018/34/o-pustoslovii/
https://www.kommersant.ru/doc/3720254
https://www.kommersant.ru/doc/3720463