The U.S. could simply issue a statement:
“The U.S. believes a nations’ primary, if not sole responsibility, is protecting the individual liberty of its citizens. We do not condone actions by governments that violate their citizens’ liberty, nor do we support populist democracy movements whose goal is to seize power only to swap the government with a different set of violations of individual liberty.
We hope those involved in the current problems in Hong Kong consider their ultimate goals in terms of human rights: life, liberty and the pursuit of happiness. We denounce any and all efforts by any party that are contrary to that sentiment.”
It would be a lie, though, because most all in the U.S. Government don’t believe this in any way whatsoever.