Sr-71 are fast and good for recon but they dont carry any missiles and thats were the mig 25 comes in but also the mig 31 is based on the mig 25 with better avionics bigger weapons load and also it has a state of the art radar with 200km Lock-On capabilty so that means it wont be able to catch but it can always lock on the missile and shoot it down beacuse missile is faster.
