Here's What You Need to Remember: The MiG-31 is the standard long-range interceptor of the Russian Air Force.
While the Su-57 is fast, it does represent a step backward in speed compared to the MiG-31.
During the Cold War, the Soviet Union’ s Air Defense Forces (VPVO) needed a series of heavy interceptors to patrol its massive borders. Most regular “light” fighters like the early MiGs were not up to the task, as they lacked the range and speed to intercept to rapidly climb and intercept supersonic American bombers, who were expected to zoom over the Arctic to drop bombs on the Soviet Union.
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