(Reuters) - The father of a Moroccan man sentenced to death by a court in the self-proclaimed Donetsk People's Republic (DPR) on mercenary charges said his son should be treated as a prisoner of war as he is a Ukrainian national who handed himself in voluntarily.

       Morocco-born Brahim Saadoun and Britons Aiden Aslin and Shaun Pinner were found guilty of "mercenary activities and committing actions aimed at seizing power and overthrowing the constitutional order" of the DPR, Russian media said last week.

       The three men were captured while fighting for Ukraine against Russia and Russian-backed forces.

       The Moroccan fighter received Ukrainian nationality in 2020 after undergoing a year of military training as a requirement to access aerospace technology studies at a university in Kiev, his father Tahar Saadoun said in an email to Reuters.

       He handed himself in "voluntarily" and should be treated as a "prisoner of war", the father said.

       The sentence will be appealed, he said.

       "We as a family suffer from the absence of contact with the lawyer to exchange legal information and this adds to our ordeal," he said.

       (Reporting by Ahmed Eljechtimi; Editing by Toby Chopra)