Russia: How Alexei Navalny's case sparked mass protests?

Navalny, a harsh critic of the Russian government, was detained on January 17 upon his landing at a Moscow airport from Germany, where he had received medical treatment for alleged poisoning over the past few months.

His detention sparked ongoing mass protests in major Russian cities, including capital Moscow, St Petersburg, Novosibirsk, Yakutsk, Omsk and Yekaterinburg.