BK, the recee Mig-25R has no defensive armament and relies totally on Mach 3 speed. It's the fighter version Mig-25s with pylons that only fly at Mach 2.83 simply because they're more heavily loaded. Recee photographs of militant training camps across the Line of Control, images of Pakistani army and armoured corps movements, mapping of new roads built by adversaries deep inside forbidden territory, was all the work of IAF Foxbats flying well above 80,000 ft. pressing home at Mach 3, unless you strapped in your seat in front of a Pentium IV think you know better than a Foxbat pilot
To do the Mach 3 talk, you gotta do the Mach 3 walk
