The reason why UAE buys Rafale is not to put all egg in one basket. Your KFX uses american engine and american subsystems. It is not sanction proof if things turn sour between UAE and USA.Not that long inshaAllah. You need to understand that new F 35 can only be delivered starting at 2028 due to huge F 35 program sales for US and European/Australia/Japan/South Korean needs.
KFX block 1 can still compete with Rafale since I bring KFX/IFX into a conversation because there is talk to buy 60 rafales, you need to read the post until the end. KFX block 1 also has half internal weapon bay in the plane belly and already has Stealth feature. It can be quite Stealthy if the plane only put 4 missiles in the belly without fuel tanks
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KFX block 2 software is already been developed and its shows 6 missile inside weapon bay
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Rafale is 100% french made and the product is quite developed.