zipping Russian Character folders using powershell

Hi every One I am trying to zip some folders which includes some russian character 
but i am getting an error that "cannot compressed the folder because it includes 
character that cannot be sued in a compressed folder". 
This is my zip script which i am calling from my main script
$path = $args[0]
$files = $input

if (-not $path.EndsWith('.zip')) {$path += '.zip'} 

if (-not (test-path $path)) { 
set-content $path ("PK" + [char]5 + [char]6 + ("$([char]0)" * 18)) 
} 

$ZipFile = (new-object -com shell.application).NameSpace($path) 
$files | foreach {$zipfile.CopyHere($_.fullname)}