I believe the EU has just laid down some regulations that state MD doesn't conform with EU standards and have basically forced a lot of places like americansoda to stop *selling it. Not sure if its illegal to import it or just illegal to sell it, either way if customs get a whiff of it in your luggage you may have an issue.
*Strangely enough, it's only the original MD they're not allowed to sell, it seems they can still sell the code red and other flavours?