die Russin
Russian woman
A female person who has Russian citizenship or comes from Russia.
Die neue Tennismeisterin ist eine junge Russin aus Sankt Petersburg.
The new tennis champion is a young Russian woman from Saint Petersburg.

Russian woman
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Russian woman
A female person who has Russian citizenship or comes from Russia.
Die neue Tennismeisterin ist eine junge Russin aus Sankt Petersburg.
The new tennis champion is a young Russian woman from Saint Petersburg.

'Die Russin' (the Russian woman) belongs to a word family. The country is called 'Russland' (Russia), the quality or language is 'russisch' (Russian), and the male person is 'der Russe' (the Russian man).
Sie ist Russin und spricht fließend russisch.
She is Russian and speaks Russian fluently.
The ending '-in' is the typical way to form female personal nouns in German, especially for professions and nationalities. The male counterpart here is 'der Russe' (the Russian man).
Meine Nachbarin ist eine Polin aus Warschau.
My neighbor is a Polish woman from Warsaw.
It is important to distinguish the noun 'die Russin' (the Russian woman/person) from the adjective 'russisch' (Russian). You say 'Sie ist eine Russin' (She is a Russian woman) or 'Sie ist Russin' (She is Russian), but 'Ihre Familie ist russisch' (Her family is Russian).
Anna ist Russin und lebt seit fünf Jahren in Deutschland.
Anna is Russian and has lived in Germany for five years.
Russian
'russisch' and 'die Russin' both refer to Russia, but grammatically they belong to different groups. 'russisch' is an adjective and describes, for example, language, culture, food, or origin. 'die Russin' is a noun and means a female person from Russia or with Russian citizenship. The words can be confused because they look similar. A practical tip: for a thing or quality, use 'russisch'; for a woman, use 'die Russin'.

Im Park habe ich mit einer Russin über das Studium gesprochen.
In the park, I talked with a Russian woman about studying.
Sie lernt seit einem Jahr russisch, weil sie die Sprache schön findet.
She has been learning Russian for a year because she thinks the language is beautiful.