The Chinese ambassador has said that the practice of including Chinese companies in the list of war sponsors will have negative consequences for bilateral relations between Ukraine and China. Source: Reuters with reference to its own sources Details: The National Agency on Corruption Prevention has added 14 Chinese companies to the list of international sponsors of war.
Knowing China, a phone call involving someone from the US as well as Zelensky would probably go a long way. I doubt Xi is particularly invested in Chinese companies helping Russia, but he would take issue with Ukraine not going through him about it.