Where is "Moschna"?

In their Hamburg departure passenger listing (see this post), Stefen Ramik and Piotr Gemsa stated that their "last place of residence" (Google translation from the German) was a place called "Moschna". For now I assume it is somewhere near modern day Kiev, but I want to post this puzzle here for future research.

One candidate is Mosna, Romania. Here is a German language Wikipedia page for that city, translated by Google (so the grammar is weird in places:

https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fde.wikipedia.org%2Fwiki%2FMo%25C8%2599na_%28Sibiu%29&edit-text=&act=url