From earlier: China commerce ministry announces export control on some rare earth equipment, materials
This is China's ace card and they won't be using it all too often and unnecessarily. The latest move here appears to be a statement of intent in sending a message to the US ahead of a meeting between Xi and Trump in South Korea later this month. As a reminder, China's move to suffocate the US on rare earths played a key role in eventually seeing both sides back down on the tariffs war that started in April. So, watch this space.