нерусь

не (ne) +‎ русь (rusʹ); literally, “non-Russian”.

• IPA^(key): [ˈnʲerʊsʲ]

не́русь • (nérusʹ) f inan (genitive не́руси, nominative plural не́руси, genitive plural не́русей)

1. (colloquial, derogatory, ethnic slur, usually collective) aliens, foreigners, outlanders (from the Russian perspective); people with no Russian ethnic or cultural relation

Modern usage is derogatory and associated with Russian nationalist discourse.

Historically, the term was used more neutrally, for example, in poetry.

• неру́сский (nerússkij, “a non-Russian”) (neutral)

• вы́русь (výrusʹ, “Russians who abandoned the Russian identity in favor of another one”)
• о́трусь (ótrusʹ, “Russians who have lost their Russian identity but not joined another”)