TE> Cyrillic is not a double byte characer set; cyrillic letters are
 TE> encoded in 8 bit ASCII [...]

There is no such thing as "8-bit ASCII".  ASCII is a 7-bit character set.  

8-bit character sets are the ISO 8859 character sets and the IBM PC code
pages, not ASCII.  So the above would have been better expressed by saying
that to use Cyrillic letters one uses either ISO 8859-5 or one of the
Cyrillic code pages (855, 866, or 915).

 ¯ JdeBP ®

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