Vietnam is also in a stage of upgrading its AF,a twin engine fighter like Mig-29 and SU-30 might prove too expensive for Vietnam to afford in quantity numbers. Going for FC-1 is a smart solution to allow Vietnam to overhaul and upgrade its AF. With US as China arch enemy,China will not hesitate to court Vietnam and a conflict in few decades is very unlikely..
Burma possess plenty of natural resources from gem to fossil fuel,China is willing to trade their fighter for any barter trade deal. I don’t see a probelm for Burma to buy 30-40 FC-1 at a price of 15million USD each!
VietNam and China have their claims in the Spratlys, buying Chinese hardware is like committing suicide for the VietNamese air force because the PRC can use military hardware as a political tool by not supplying spare parts. That’s if VietNam ever decide to be stupid and buy Chinese planes.
As for Myanmar, well, it makes alot of sense since the PRC already arming the military regime. And I don’t think the Generals of the ruling regime want their air force to rot away while the RTAF is quite arrogant with their F-16s and future Gripens.