I'm pretty sure no one has nukes because I timed the completion of Manhattan project and the resolution voting just right
Anyway here is the save; I haven't managed to get the CTD yet, but I'll keep trying.
View attachment 340802
Edit: It seems I get something else now; If you play the save use the F35s in the carriers to Air strike the nearby Celtic capital. I always CTD when I do that.
I've tried a few times but I haven't been able to reproduce your ctd. I can air strike celtic capital without any problem and I can continue playing.