previously they were flying mig-25 & 31 and these planes can go higher, especially mig-25, yet they are older and seems to be more harder(expensive) to maintain

previously they were flying mig-25 & 31 and these planes can go higher, especially mig-25, yet they are older and seems to be more harder(expensive) to maintain. https://www.youtube.com/watch?v=izIClWYKK1o https://www.youtube.com/watch?v=izIClWYKK1o