From Wiktionary, the free dictionary
ру́сских • (rússkix) f anim pl
- genitive/accusative/prepositional plural of ру́сская (rússkaja)
ру́сских • (rússkix) m anim pl or m inan pl
- inflection of ру́сский (rússkij):
- genitive/prepositional plural
- animate accusative plural