unicode or cyrillic in postgresql

Hi all,

I have created a new db with unicode options.
After inserting some data (varchar defined) into my table,
I started select * from mytable order by my_varchar_field.

I was supprised, but the sorting do not work!

Is it a bug in postgresq or it do not support unicode sorting?

Can I use nvarchar as datatype in postgresql ?

Exist any direction to point me for unicode and cyrillic in postgresql?

Many thanks in advance,
Ivan.