Huge! Ukraine to block access to Russian Social networks and other sites: https://meduza.io/en/news/2017/05/16/ukraine-blocks-access-to-russian-websites-yandex-vk-and-odnoklassniki

(They are run by the FSB.)

What percentage of Ukrainians use these sites?
https://www.unian.ua/politics/1924464-v-ukrajini-zablokuyut-dostup-do-yandeksu-vkontakte-i-odnoklassnikov-ukaz-poroshenka.html