A new (export?) AA gun, the LD35. I don't recall seeing it in the flesh. Maybe it will show up at the next Zhuhai Airshow.
The "unable to import theory" doesn't sound right because they already have RU 23mm before developing the 25mm ammo, and I don't think there's such a big difference between 23mm and 25mm in AA performance (both in speed and payload).I theorise the 25mm caliber came about when the PLA was unable to import from both sides of the iron curtain in the period of time between Tiananmen to the collapse of the USSR and decided it was easier and cheaper to just neck up an existing cartridge or it could just simply be that the PLA thought it could just go it's own way on some weapon RnD.