Why was this case tried in military court?

From Russia, with love of unusual court procedures, a sociologist and Marxist theorist had a five-year jail sentence imposed on appeal. The state appealed a military court's decision to fine Boris Kagarlitsky 600,000 rubles ($6,600ish). The military court found Mr. Kagarlitsky guilty of "justifying terrorism" for a video he produced on the 2022 Ukranian attack of the Crimean Bridge. Unhappy with the leniency the trial court showed this civilian, the prosecutors found a more receptive bench at the military court of appeals.   

While this is not the biggest news to come out of Russia recently, it is another entry in a never-ending series at this blog, "Why was this case tried in miltiary court?"