Hi,
No client succeed in send files with cyrillic characters in the filename.
However, I change the ftp server to use utf8 compliant ftp server and it works!
Previously i used IIS 6 (impossible to send my files with cyrillic characters in the filename), now i use FileZilla, i have tested with cyrillic and chinese characters after specifying ControlEncoding as Utf8 (with bom) , and it seems to be ok!