China and its companies are being very careful to avoid western sanctions. They are avoiding selling anything to Russia which may be viewed as a violation which would cause sanctions to be placed on China. For example -- notice the complete lack of automobile parts available in Russia which are sourced from China..
China at this point really cares less about Russia -- and would be joyful if both Putin was shoved out as the leader and Russia disintegrated via conflict into multiple regions.
Don’t panic. Get your Google translate out and read this -
https://www.forbes.ru/biznes/469307-gosduma-legalizovala-parallel-nyj-import-v-rossii