[Kone]

Mig-23s and 27s were withdrawn in the 90's as well as su-17s, leaving Russia without a serious strike fighter. Perhaps the reason why they're still available is, that many were not scrapped but are kept in open air storages theoretically as reserves. Same thing with many tanks I guess.

Another matter is if the craft remain airworthy or not. I guess they could be resurrected even a couple of years after being mothballed but at 2020; no way.