text:  Wall Street Journal reporter Evan Gershkovich has gone on trial in Yekaterinburg, Russia, the city where he was arrested on espionage charges while on a reporting trip for the newspaper. In court, Evan Gershkovich stood in the metal and glass cage that's known as the aquarium. Head shaven and wearing jeans and a check shirt, he flashed an occasional smile. But the U.S. journalist knows that if convicted, the maximum possible sentence is 20 years in a Russian penal colony.