Chinese have been observing the sanctions when you look Crimea example from 2014. This give indication to west that every Chinese product has western IP or China need western markets. so for them China is not much different than Turkey or Iran.
I dont think there is any official car dealer of Chinese brand in Crimea. There was no Huawei brand store in Crimea. or any Chinese contractor made infrastructure in Crimea. forget any direct Chinese tourist flights.
Russian invited Erdogan to big Mosque opening in Crimea but he not dare to cross this line.
Crimea is place that Russian spend fortune not just military or bridge. where you can find snow, trees, peaks right on ocean in February.