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Usage notesEdit

The word росси́йский emphasizes belonging to Russia, as a citizen or resident regardless of ethnicity, as opposed to ру́сский (rússkij), which indicates ethnicity, etc. In some cases the words may be used interchangeably.
https://en.m.wiktionary.org/wiki/%D1%80%D0%BE%D1%81%D1%81%D0%B8%D0%B9%D1%81%D0%BA%D0%B8%D0%B9
こういうことらしい