which charset use for cyrilic?

Hi

Which charset is need to be set in database for cyrilic?

I've used till now WIN, but today I found a problem

for example:

SELECT *
FROM table
WHERE a = 'слово'

returns me a record, where a = 'фраза'

after I tried UNICODE
but for most of cyrilic words PG gives error like
"invalid byte sequence for encoding "UNICODE":..."

Regards,
Zet