In Russian language there are 2 different words that are translated into English as "Russian".
The first is nationality. For example (in English), Russian man (even he's Tatar or Chechen, but has Russian passport).
The second is "Russian language" that means "language of ethnic group of Western Russia" (there are 24 official languages in Russia: Russian, Abaza, Adyghe language, Altaic language Bashkir language, Buryat language, Ingush language, Kabardino-Circassian, Kalmyk, Karachay-Balkar, Komi has Nogai language, Mari, Moksha language Ossetian language, Tatar language, Tuvan language, Udmurt, Khakas language Circassian, Chechen language Chuvash language, Erza, Yakut) and 174 languages in all (including non official).
In Russian, words "Russian man" mean that the man has ethnic group of Western Russia. How can I say it in English?