Today, the Russian Federal Service for Supervision in the Sphere of Telecom, Information Technologies and Mass Communications instructed all Russian internet providers to block all user access to Wikipedia. All involved parties are aware of the development. I am not sure whether only ru.wikipedia.org will be blocked, or all WMF projects. In the latter case, if you are going to travel to Russia, you will need to gen an IP exempt flag in advance in the projects you are going to edit.
Cheers Yaroslav