We let see with market forces.
China will not standby.
There is no way that China is going to allow NATO and allies to build military bases in North Korea up against the border with China. Any attack on North Korea is an attack on China.
North Korea is China's Israel.
When China makes this absolutely clear, that is the time when America begins to place duties on Chinese imports and bring on the trade war which has been planned on for 20 years. Obama called it a "Pivot".
US missle bases run from Australia to Japan and they are aimed at China.