Based on the body language coming out of China, Xi denied any assistance with Iran. Just your customary business deals; Trump first says no then yes on chip sales.
Here is an honest update to the Iran war. You can listen to the article if you like.
https://www.miamiherald.com/news/nation-world/world/article315753720.html
We must remind ourselves that one reason we are struggling in the Persian Gulf is because China continues to buy Iranian oil.