Well, does France, say, still have an ambassador to the UK? Why? Does Alaska have one? No, but the US has one. So if the EU wants to be a country, accept their ambassador, and send away the ambassadors of France, Spain, Italy, Greece, and all the rest.

But if you've got ambassadors from all of those countries, why should you have an EU ambassador? If France and Germany are countries with ambassadors, then what's the EU?