Prosecutors say that American Stefan Hubbard, who has lived in Ukraine since 2014, fought with a territorial defense unit. A Moscow court ordered that the trial of a 72-year-old US citizen, accused of fighting as a mercenary for Ukraine, proceed in secret on Thursday. The man, identified as Stefan Hubbard of Michigan, appeared in court wearing a black hat and beige jacket, walking slowly and dragging his feet, an AFP journalist reported from the court. He faces up to 10 years in prison for fighting as a mercenary on the side of Ukraine, Russian news agencies reported. At the start of a hearing…