... North Korea is a big fat NO, due to the fact that any arms sale to North Korea will be controversial (with China, Japan, the US and the South Koreans, and literally everyone else in the region) and the fact that it's a political hellhole as well as a greyzone. ...
When did you last see the Putin regime shying away from anything controversial (corrupting everyone in sight, killing off opposition & journalists, supporting state terrorism elsewhere, waging open war against Georgia and Ukraine in the middle of Europe, election meddling, sending "mercenaries" all over Africa, dealing nuclear reactors all over the Mideast, incessant hacking, etc.)? They're basically
the gray zone operator currently (although many copycats have emerged).
About the only major exception is the empennage, with separate all-moving fins and trimmers instead of a Pelikan tail that I'd have preferred. I get the attraction of reusing the Su-57 fins, but you have to wonder how big the savings (essentially one-time, on development and tooling) really are. Especially when you have to fit each and every aircraft with two additional actuators (which need maintenance) and do require some bespoke development & tooling for the trimmers. Not to mention the RCS impact from the rear, though this is of course not the most important aspect angle, so probably acceptable.
