Already foreign entity has incurred considerable loss, from the confusion created by the website. This could be the only reason they might create some problem.
Domain names are often referred to simply as domains and domain name registrants are frequently referred to as domain owners, although domain name registration with a registrar does not confer any legal ownership of the domain name, only an exclusive right of use.
If website was more popular than foreign entity & if it is a very new one from your client's side.
Strongly feel your client can consider to sell his website to foreign entity. It should fetch good amount of money.
Feel free to Contact me, if you need further details.
Trademark Attorney & IP Lawyer
IP Lex Global Services