Some time ago this example used to work:

\enableregime[utf]

\usetypescript[modern-base][t2a]
\setupbodyfont[modern]

\starttext
Немного текста.
\stopbuffer

This requires cm-super package. Unfortunately after some update this stopped working.

If someone puts me on a right way to start debugging font loading mechanism I'll try to sort this out. Problem is that map files seem to be loaded, fonts are installed in right places but ConTeXt doesn't try to generate tfm. It just always uses default fonts (LM ones with ec encoding). I've tried varous combinations (\setupencoding, fiddling with typescripts) with no difference. Tried this on MkII, as MkIV seem to require even more tuning.

Gour wrote: 
Hello!

I was able to persuade one user to prepare ConTeXt package for NixOS
distro, but, unfortunately, being from Russia he quickly discovered that
he minimal example from wiki (http://wiki.contextgarden.net/Russian)
does not work, i.e.

\enableregime[utf]
\useencoding[cyr]

\definetypeface [russian]
  [rm] [serif] [computer-modern] [default] [encoding=t2a]

\setupbodyfont[russian]
\starttext
Мама и Папа % Some Russian characters
\stoptext


does transliterate Russian characters.

I do not have any experience working with Cyrillic, so if anyone can
provide minimal working example it would be very nice?

I persistently claimed that "it must work!" :-)


Sincerely,
Gour

  

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-- 
Best Regards,
Oleg Kolosov