as we know, Britton wants to purchase TB2 drones from turkey.. what if we sell them TB2 and instead we receive Eurofighter? also, as there would be no f404 engine, Turkey can use EJ200 engine on Hurjet, at the same time purchase Eurofighter, so using the same engine for both would work perfect for Turkey, also it might pay secret money to do some TOT on engine parts.. UK, Italy, Spain and even recently Germany(even if Germany refuse, UK still can finalize the sales) are on Turkish side. these countries work together in Libya, in Qatar, in Azerbaijan, even want to work together to bring gas from Turkish countries to EU, as since last year Chine stop 50% of their gas supply and they are actively looking for new market.. and ready to spend money for that.. its totally win win situation..
on the other hand, if Turkey spent 2.5$ billion on s400, why not to spend the same amount on Eufighter, especially when those jets will take 3-4 years and the money will be divided..