It's possible to set your buyer requirements to exclude particular bidders, or bidders from certain countries. Probably a better option than letting them make a bid and having to tell them it is cancelled afterwards. I very rarely sell on ebay, but when I have, my buyer requirements are set so that only bidders from countries I want to sell to (Ie Australia) can place a bid.I've sold a ton of international, and in fact that's where the market seems to be best presently. Last four deals to Federation of Russia.
I have never sold to anyone in France. In fact when someone from France bids on my items, I remove their bid and contact them that I do not sell in France.
Perhaps many of you don't know about the French. For the most part they hate Americans. Go there for vacation some time.
Oh, and my last name is Cousineau. Bred and Born in the Good Ole USA!
Regards,
Brett