You need to use the proper character sets. UTF 8 should work fine for Russian I think but if necessary you can use Unicode (UTF-16) encoding.
I assume you're returning XML responses from your Web Services? Look at the return flags of CursorToXML() to make sure you use UTF-8.
+++ Rick ---
>That all great, but may be anybody can explain how to transfer data (write into database file) on server that consist of national alphabets (like Russian)... English language works perfactly, but Russian changes incredibly changes. I could encrypt receiving from derver (use chtrn() function), but it have to be more easy way ...
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>>In case you haven't seen it...
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http://www.perfectxml.com/articles/websvc/MSWebSvc.asp#foxpro