The Mig 25 Foxbat was designed to intercept the XB-70 Valkrie initially and assumed an SR-71 hunter role when the XB project was cancelled. It is the fastest combat aircraft ever produced (the SR-71 was designed from the outset for a reconnaissance role). It is capable of mach 3.2 speeds and can reach altitudes well into the stratosphere. It is powered by two Tumansky R-266 turbojet engines, each developing a maximum thrust of almost 30,000 pounds. Although it was never intended to be a dog fighter, it will outrun any combat aircraft currently in service in the US Air Forces.
Cockpit view from ~80,000 ft (24 km)