This best thing is to complain to the web host and registrar, in this case network-abuse@cc.yahoo-inc.com. They're pretty good at suspending fake sites. Send them a copy of your email WITH the headers and also mention that although the registrant gives an American address (fake), it is a Russian company.
Domain Name.......... westernsoft-company.com
Creation Date........ 2007-03-17
Registration Date.... 2007-03-17
Expiry Date.......... 2008-03-17
Organisation Name.... Maya Kernaghan
Organisation Address. 191 Hgh Meadow Road
Organisation Address.
Organisation Address. Southport
Organisation Address. 06890
Organisation Address. CT
Organisation Address. UNITED STATES