If you tell me a reason why some AliExpress seller should create fake reviews which appear to come from ukraine or russia specifically, let me know.
You can never be 100% certain of anything.
For me all the signs point to china selling to whoever is buying stuff from them, especially since its not the government or even large conglomerates, but factories and companies of all sizes and shapes that sell drones and other dual use items.
As long as there isnt any blanket ban from the government they sell to everyone, because why would you make less profit if you could make more?
I dont know if there are big price differences when buying wholesale depending on which country you buy from, but there definetly arent any when buying single items.
I also think that china isnt supplying russia because it wants russia to win, but because it wants russia to be dependent on them.