This is Tom Clancy fairy-tale nonsense. China wants a nuclear-free Korea, for the same reason that the United States wants a nuclear-free Mexico and Canada. Nuclear super-powers aren't keen on letting their neighboring satellite states limit their foreign policy, by arming them.

A carbon tax is not 'stopping trade'. It's an increase to the price of goods that are energy-intensive to manufacture, or ship.

They'll do that regardless when the time is right.

This is pure speculation. Meanwhile, our government is actively invading and occupying how many countries?