Our only other reasonable option is RR, Russia and Chinese are not. Otherwise, yes, Kaan is going to be delayed until our engine is ready.
I don't know what ToT RR would agree to. How much is required to make TF35000 sufficiently good to be acceptable? A lot? A little? Naive enquiry, I know.
RR is involved with the GCAP engine. I imagine that RR has had the sort of materials/technologies necessary to make a modestly advanced engine for KAAN for a long time.
RR parted company with KAAN engine development years ago, I gather. Was that because Turkiye did not want to pay their price rather than RR refusing outright to the ToT Turkiye wanted? If the problem was price, perhaps that could be re-negotiated.
With other western OEM's out of contention, RR involvement would be the least risky but most expensive route to getting a KAAN engine within 10 years, would it not? I wonder if Turkiye is becoming more aware of the level of uncertainty associated with its TF35000 development timeline.
Just uninformed speculation!