Lc_collate & lc_type? whitespace and nbsp unique index...

I have lc_collate and lc_ctype ru_RU.UTF-8.

And have two similar value column in different rows.

Different is that in one string have whitespace symbol, but another non breakable whitespace symbol.

For example:

Something(whitespace)wrong

Something(non breakable space)wrong

And then when I try to create unique index I catch the error - can not insert duplicate key in row object.

That means that the two rows are the same.

Are there any settings in postgresql that can differentiate this two symbols?