Just remind the germans of...
the Lockheed Starfighter and what a few [cough, cough] contributions did back in the 1960's.
Even probably the most experienced test pilot (Eric Brown) in the world found the Starfighter (After the mods needed to make it suitable for the task in hand) a heavy workload plane to fly. Many Geman Pilots died trying to fly the thing.
Then given the moves that Spain made (because they were broke) does make the Munich decision all the more sad. Perhaps there is indeed an Enemy Within?