They’re relying on the PLAF. Modernizing their Air Force would be too expensive and time consuming to do in a realistic timeline.
It also fits with North Korea’s general long term air power strategy, as all their jets are Soviet models that were cheaper then developing their own.
68% of the worlds uranium is mined in Khazahstan, Canada, and Australia. Uranium isn’t a primary export of any African market for the exception of French colonial states shipping to France, who demands those exports because it’s cheaper due to political influence.