I think NEO plans to involve involuntary evacuation should start to take place. Another thing that would turn the Chinese shit white would if the State Department clearly advises NO US citizens to visit or stay in China’s northwest provinces such as Heilongjiang, etc., bordering North Korea. They don’t need to say “why”, just “go there.”
correction: “just DON’T go there”
Many media reported that residents in N. East China are terrified of nuclear fallout if N. Korea's nuclear test goes wrong. Now they have to deal with worse cases. Using conventional weapons, U.S. could bomb NK nuclear installations many of which are near Sino-N. Korean border, resulting in a release of radioactive materials. There is also very remote but non-zero chances that they will be hit by U.S. nukes.