I can't say I like the idea of getting too cozy with the US and Europe and making a habit of buying military equipment again. The idea of "necessity is the mother of invention" caused the meteoric rise of Turkish defense industry with a speed not seen elsewhere. We have done what we did because we had to. In the times we had the possibility to buy off-the-shelf from abroad, the domestic industry suffered. What starts now as a good supplement purchase to Kaan may in the end cause Kaan to be cancelled with rising costs and/or shifting political environment.
Being friendly enough to get F110 engines is desirable but purchasing too many foreign fighter planes becomes worrying. I kind of support keeping the S400, not because we will get any value out of that crap but to maintain the sense of urgency and necessity in our defense industry that propelled us to achieve so much in so little time. Otherwise we may go back to snorting foreign purchases like cocaine.