Europe has so many parties. But they all agree on this because to disagree would be to attract an aerial democracy delivery from the USA.
They all agree on this because it will be a hidden sticking point for some others, If that's not an impediment some lobyists will make it so. If that doesn't work us ambassadors, state departments and/or USTR will pressure or even put you on a trade watchlist. If that doesn't work some 3 letter agency folks will land on a domestic airfield and have some talks. If that doesn't work some media might peculiarly shift it's tone. etc