A recently returned Ukrainian prisoner of war — whose Moscow captors medically tortured and branded him with a scar reading “Glory to Russia” — pledged to rejoin the fight as soon as he recovers from his wounds. Andriy Pereverzev exclusively told The Post from his hospital bed in Ukraine that he would return with vengeance to the battle for his country’s freedom against Moscow after suffering macabre and humiliating treatment akin to the maniacal habits of Nazi doctor Joseph “Angel of Death” Mengele in Russian captivity. “After I will be healed, I want to go back to protect and fight...