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.).
Vietnamese language
Vietnamese is the sole official and national language of Vietnam. It is the first language of the majority of the Vietnamese population, as well as a first or second language for the country's ethnic minority groups.
In the Czech Republic, Vietnamese has been recognized as one of 14 minority languages, on the basis of communities that have resided in the country either traditionally or on a long-term basis. This status grants Czech citizens from the Vietnamese community the right to use Vietnamese with public authorities and at courts anywhere in the country. Moreover, it also grants the use of Vietnamese in public signage, election information, cultural institutions, and access to legal information and assistance in municipalities where at least 10% of the population is of the minority group.