Mach 3??? Jeez, that’s a fast piece of fighting aluminum.
What we did not know until we debriefed a defecting Soviet pilot, who flew his MiG-25 to Japan, was that the plane over Israel had all but melted it's engine, that most of the airframe was rather poorly welded stainless steel, that the mechanics were drinking the alcohol based hydraulic(?) fluid, the radio and other electronics were still using vacuum tubes, and that it was solely intended as a B-70 interceptor, by getting close enough to launch a missle. (We never actually brought the B-70 on-line...)