In case you’re looking for background, this concerns the arrest of Alexei Navalny, a Putin political opponent. He was recently poisoned (almost certainly by the Russian state), treated in [EDIT: Germany], and immediately arrested upon return to Russia. Now his wife and other associates have also been detained. There are widespread protests as a result.
See https://ground.news/article/7bdfdb69-fbf5-4fb5-be1b-43c8d8b3... for articles related to the protest from different news media with various biases.