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.).
Chechen–Estonia relations
Dzhokkar Dudayev, before becoming the first president of Ichkeria after winning the democratic election in a landslide had been the commander of the 23rd Strategic Bomber Division in Tartu. In Tartu, Dudayev learned the Estonian language and spent countless hours learning about Estonian and Finnish history, and is thought by some to be an Estophile (a classification given to many Western-minded Chechens). Colonel Ants Laaneots remembers talking to Dudayev when they were wearing civilian clothes in a cafe and discovering that Dudayev was strongly sympathetic to Estonia.