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The project which resulted in the MiG-25; E-666 was initially started to counter the SR-71. When the B-70 programme came, then modifications were made to the original design, mainly concerned with extra range, the E-666 basically could take off fly at Mach 3 to 100,000 feet and come down. These changes and moification persisted despite the cancellation of the B-70. It was a better plane as it is.
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"Any relations in a social order will endure if there is infused into them some of that spirit of human sympathy, which qualifies life for immortality." ~ George William Russell
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