Since all fighters I flew required afterburner to maintain Mach plus speeds. When in A/B, and using only internal tanks (not many were rated for Mach plus speeds), the machine had roughly 15 minutes or so of fuel. Not exactly optimal for an Atlantic crossing.
And given some other info we had on the Mig at the time, I believe that the engine life was only slightly longer than the afterburner time.
Even then...more power to the Russians if they can pull this off.
Oops, I meant to say that “...not many external tanks were rated for Mach plus speeds....” Forgot the “external” part.
Gasp, my mind is going. I must be becoming a liberal. Ptui, ptui.