[thriftwy]

I believe he's not Petrov but Petro after all (out of options listed in the article)

You are unlikely to have no first name and two last names, and Zailenko looks like a last name, so the other one is likely a first name, which would be Petro.

Of course there is always a chance that he is Petrov-Zailenko.

[vzaliva]

-enko is a common ending for Ukrainian last names and Petro is Ukrainian first name.

[mehal]

Thank you for pointing it out! Name is definitely Ukrainian, so no russian army, because in Second World War the was Red Army of USSR

[thriftwy]

No Russian Army because he was born around 1914. Otherwise, of course you would find a lot of people with -enko last name in Russian Army in WWI. Not only Russian Empire controlled most of present-day Ukraine but also parts of Poland.

[mehal]

He was captured by Nazis during Second World War

[justsomehnguy]

https://news.ycombinator.com/item?id=38765757