There will be no old hardware left, it's being destroyed at an unbelievable rate.Not if you value your sovereignty but there will still be plenty of tin pot dictators in Africa and Asia who will be willing to buy old hardware for knocked down price.
Russia had one customer willing to buy the SU-57 but when India saw Russian couldn't deliver on it's promises it pulled out the $6b venture which has starved the SU-57 program of cash.
They have burned through all the good stuff and are now in 40 year old tanks
They are even using the missiles that that would normally carry a nuclear warhead
Russia are running on fumes, how long before their allies stop supplying them, they could burn through their stocks to.