Ukraine absolutely had fleet of functioning ICBMs and strategic bombers. Unlike russia, Ukraine didn't declare bankruptcy.
And pretty sure people who built those ICBMs and strategic bombers would have no issue maintaining them.
USA didn't pressure Ukraine into giving up nukes, at the same time bankrolling russian nuclear program for 'security' reasons.
Ukraine didn't declare bankruptcy because Russia chose to assume 100% of the USSR external debt. Meanwhile, in 1998, Russia had a GDP PPP 80% higher than Ukraine.