Here are the details.
Not Flying Under the Radar: How Europe Could Get Its Own Stealth Fighter
Therefore, Airbus has specifically pitched a European stealth fighter in terms of keeping the business in Europe—not only for economic reasons, but because if European nations don’t continue investing in domestic jet fighter production, they may rapidly and permanently lose the industrial base and know-how to do so in the future.
The French Armée de l’Aire and the German Luftwaffe are at a crossroads: by now, both countries have established their respective 4.5-generation fighters into service, the Dassault Rafale and the Eurofighter Typhoon. Both highly capable jets are planned to remain operational for at least two more decades. However, the European leaders lack true fifth-generation stealth aircraft to replace them—and no such plane is close to being developed, as embarking on such a project would be monstrously expensive. Indeed, Japan seems to be backing away from developing its own stealth jet despite having built a flying demonstrator.
(This first appeared last year.)
Berlin, Paris and London have historically preferred to purchase major weapon systems from their domestic arms industry rather than shopping abroad. The high cost of developing jet fighters has compelled European capitals to pool development costs and work together, producing aircraft such as the Franco-German Alpha Jet trainer and the Franco-British Jaguar attack jet.