What will be interesting is what Britain will do as they still technically still own Hong Kong per their treaty with China until 2041. This is China's and Britain's affair to settle. If the US stays on the side and not involved it will benefit the US the most.

If anyone needs to be involved it is the useless organization on the banks of the Hudson in New York that is 'supposed' to represent all the world in preserving peace. You remember the 'UN'!