I know that the Russians did not have many reasons to be kind to the POWs, hell the country was so busted up they could barely take care of their own people. I read an article about the condition of the Germans that surrendered at Stalingrad, they were so sick and starved a very large percentage died in the first few weeks after capture. The Russians tried to save some after they were shipped to the Khazahkistan area but the people there had little know how in caring for people in such poor condition, let alone the resources.

War is tragic. It's hard to think about at times. It also stated that many of the POWs stayed in Russia after the war voluntarily, not a lot but some did. I have never found any more info on that than a paragraph or 2.