This is the 15082nd most frequent Polish word.
ruskich
"Ruskich" is an informal, colloquial term in Polish meaning "Russians" (genitive or accusative case).
The term 'ruskich' is used informally to refer to Russian people in this context.
Poznałem kilku ruskich na wakacjach.
I met some Russians on vacation.
Here, 'ruskich' refers to films of Russian origin in an adjectival form.
Ruskich filmów jest w tym roku więcej w kinach.
There are more Russian films in cinemas this year.
In this sentence, 'ruskich' describes the media as being Russian in origin, using the genitive plural form.