Chechens
In 1989, 73.4% spoke Russian, though this figure has declined due to the wars for a large number of reasons (including the lack of proper education, the refusal to learn the language, and the mass dispersal of the Chechen diaspora due to the war). Chechens in the diaspora often speak the language of the country they live in (English, German, Arabic, Polish, Georgian, etc.).
Chechens
Chechens are a Nakh people, and discussion of their origins is intertwined with the discussion of the mysterious origins of Nakh peoples as a whole. The only two surviving (and fairly numerous) Nakh peoples are Chechens and Ingush, but they are thought by some scholars to be the remnants of what was once a larger family of peoples.