It would take weeks for China to shop stuff. (Unless they have done their homework in advance)

There's been rumors of Chinese kit arriving in Iran, but nothing concrete:

https://moderndiplomacy.eu/2026/02/10/how-iran-gained-the-ab...

If China didn't anticipate the US attacking Iran after Maduro was deposed and the resulting impacts on their oil supplies, then they are asleep at the wheel.