> Enforcement of judgments issued by foreign courts in the United States is governed by the laws of the states. Enforcement cannot be accomplished by means of letters rogatory in the United States. Under U.S. law, an individual seeking to enforce a foreign judgment, decree or order in this country must file suit before a competent court. The court will determine whether to recognize and enforce the foreign judgment.

Obviously, its not a good idea to bet your business on the courts not enforcing an EU fine when you can just add the VAT and cost of the handling hassle to the price for EU customers.

https://travel.state.gov/content/travel/en/legal/travel-lega...