What if he would take such a step,there are many alternative turboshaft engines and also the Turkish one will be ready by the time the first Pakistani T-129(4 to 5 years) is due to be handed over.
Trump cant do sh!t,even if he wanted to,delay it,yes but nothing else.
Erdogan knows he is in a position to ''demand'',Putin is on standby.
Imagine losing NATO ally Türkiye to Russia (in some sense) but most importantly, independent(hello nukes),what it would mean for the safety of Europe,Israel and the GCC Arabs.
Dont buy that bs that the KSA/UAE axis is close to Israel and arming itself to the teeth because of Iran.
We will Nuke up the minute we leave the ''western allience'',they know this.
The risks are to big for the US,atleast it tried(coupe attempt).
So,no worries.