But they are weaking EU in the proccess of weaking Russia and making China stronger. Energetically at least.
You think the China benefits is pure coincidence, I think it likely is something well pacted under the table, and Americans asked something in return to the Chinese.
In the short run Europeans take economic pain. In the intermediate term they have a stronger NATO (added Finland, Sweden). They have potential new member in Ukraine.
They have weakened Russia - we can argue it is both good and bad.
Now every time the Europeans have fought a war people outside Europe got stronger. China benefits this time. Is it a coincidence ? Yes.