Sorry for English, don't have Russian layout right now.

Currently it is not possible to specify the collate for blob text fields, only the charset on domain creation.
The only way for now is to use script execution tool and to create domains manually :)

IBExpert,

At least i tested with FB 3.0 and the following statement works:

CREATE DOMAIN DT_TEXT_UCAI AS
BLOB SUB_TYPE 1 SEGMENT SIZE 80 CHARACTER SET UTF8
COLLATE UNICODE_CI_AI;

Later I did some case insensitive searches and everything went fine.