If this spreads into a broader conflict, it remains to be seen whether Europe sticks tightly with that block. They certainly won’t align with Russia, but they may be tied so closely to China economically that they can’t afford to be dragged into a direct conflict with them. I could see a situation where they try to remain non—aligned.
Given that we now that to deploy troops to prevent the US from invading Greenland.
I'd agree, it's not a given that the US can count on Europe in a conflict with China.
But probably Europe wouldn't be trading with China or anything.
It's just given the treatment of the US administration, the US probably can't build a volunteer coalition like I Iraq - unless there is an attack on US mainland.