That's nice. Common Lisp implementations, too, allow any characters in symbol names, even spaces and the empty string. Javascript allows wide character set too. I think it's good that languages break out of [a-zA-Z_-]. That said, I'd use pretty limited charset in internationally developed multi-OS code base. People have different keyboards, input systems, knowledge etc.

That's something I wouldn't like to see in source code, as I wouldn't have a clue how to type it. How do Russians see that issue? (Is it Russian?)

I think you've missed the point: you can program in your native tongue. I think the expectation is a Russian company would not care whether you can type their variable names :P

Just because you can doesn't mean you should, but Perl isn't a kind of language that's going to stop you.