Here's more context around his arrest: https://meduza.io/en/feature/2017/04/10/mathematics-teacher-accused-of-inciting-mass-riots-now-also-accused-of-supporting-terrorism-and-once-again-detained
'According to investigators, βthe suspect posted materials calling for riots in the center of Moscow with the help of special software designed to hide traces of his Internet presence, [namely] using servers based in [foreign states].β' -- so, it seems, organizing protests in Moscow, possibly using Tor
Chirp! is a social network. It runs on GNU social, version 2.0.1-beta0, available under the GNU Affero General Public License.
All Chirp! content and data are available under the Creative Commons Attribution 3.0 license.