In a Wall Street Journal article centered on the US expanding our military presence in the Republic of China from vanishingly small to miniscule, there’s this meek remark from a “US official” regarding the training of RoC forces that that slightly larger presence would be carrying out:

One of the difficult things to determine is what really is objectionable to China. We don’t think at the levels that we’re engaged in and are likely to remain engaged in the near future that we are anywhere close to a tipping point for China….

Leaving aside the question of to which China this person is referring (the timidity of the Biden and so many predecessor administrations makes that transparent, anyway), it doesn’t matter what is objectionable to the People’s Republic of China regarding our presence in the RoC. The PRC has no legitimate interest in the goings-on with respect to the RoC.

Full stop.