Problem with locale on Solaris 8.0 intel

On the the Solaris 8.0 platform,
when database is build using Russian WIN encoding
and initdb performed using LANG=ru_RU.ANSI1251,

some russian letters for instance
"small letter e" and "small letter che" according
to unicode consortium naming, are considered equal.

so I cannot insert into key field of some table russian words
for this (ETO) and what(CHTO).

Problem doesn't occur on Linux with ru_RU.CP1251 locale

Locale itself is correctly written

perl script
---
use locale;
print (("\375\362\356" eq "\367\362\356")?1:0,"\n");
----
returns 0 with locale ru_RU.ANSI1251

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