It will most likely be smaller junior "partners" like canada, poland, etc for the time being. Maybe New Zealand, Australia or Norway will be next? It all depends on how much pressure Trump and his backers want to put on China. If he truly wants to escalate, he'll tell major "partners" like britain or germany to arrest a chinese exec/official. After that, it will be direct and open US vs China hostilities. But I highly doubt we'll get that far.
As for china, I suspect they'll arrest a polish or a poland-linked exec/official of some kind just like they did with canada or enact sanctions on poland. They have to respond or they'll look weak. It's geopolitics 101.
