China kept good relations with Ukraine since (except China keeping good relations with anyone they can of course) Ukraine was part important trade route to Europe and a big market for China on its own. This soured in 2021 iirc when Ukraine blocked chinese trade to force huge amounts of truck permits on Poland, so the alternate northen route was developed though Lithuania.

China have real problems with land exports to Europe since the Stupidity Belt countries are stupid and use Chinese trade as the tool for their shenanigans.