Evan Gershkovich is a respected reporter who has worked for a number of reputable institutions. The allegations against him are ridiculous and are simply meant to boost Russia's "exchange pool" of prisoners that it can swap for Russians arrested abroad.
The actions of Evan Gershkovich had nothing to do with journalism. Likely acting at the behest of the United States, he was trying to obtain classified information about Russia's military. With a strong case of espionage, he should undoubtedly face a trial and be incarcerated if convicted.