Not so sure I agree with that last clue. The Mig-25 was fast and had an impressive rate of climb but it took half of Siberia to turn at speed. After Viktor Belenko defected to the west, bringing a Mig-25 with him, it was learned that the Mig was no match for the American F-15 below 60,000 feet. Above that, the Mig was able to climb away from the F-15 with relative ease. What was learned is that the Mig-25 was a 1970's version of the German ME-163 Komet as it could climb to altitude, make one or two attack runs against its hypothetical B-70 bomber targets and return to base. When the B-70 project was cancelled by President Kennedy in March, 1961, the Mig became a plane without a mission.