The title says it all... how?
There are a lot of compound Russian words that have a hyphen and they need to be hyphenated just like any other word.
Polyglossia can do this for German with
"= and whatnot, but nothing like that for Russian.
A command to insert a non-hyphenation-suppressing-hyphen would be nice, a command to enable hyphenation in all such words by default would be super helpful.