A patent does not give you the right to make, use or sell anything. It only allows you to prevent others from making, using or selling what is covered by the patent. Therefore, unless there is a patent in Europe that would prevent you from making, using or selling the product in Europe, you would not have to pay royalties to the company that owns the US patent so long as the product is not made or sold from the US to Europe.
Answered on Jul 11th, 2015 at 7:56 PM