Every time I think about Kim launching nuclear missiles, all I can think of is Elvis’ hit “Return to Sender”. I’d bet the Israelis have a gadget to accomplish that.
Try this experiment. Go to Google maps and zoom way out so you can see NK, the pacific, and the US. Right-click and in the pop up menu select "Measure distance". Now click anywhere in NK, and then click and drag the other end of the measurement line to say Washington DC. That arc drawn on the map is a shortest distance "as the crow flies" and makes a decent approximation of the ground track an ICBM would take.
Notice how for just about any shot at CONUS the initial boost phase of the missile flight occurs over China and eastern Russian. You know boost phase - home of lots of propellant, max Q, lots of vibration... Typically the most stressful and dangerous phase of flight. If NK launched an ICBM at the US today, there's at least a 50-50 chance they would instead bomb China or Russia.
Maybe that's why China continues to help them. The Chinese realize the crazy little b*stards are going to do this anyway, may as well help them so their $%@!& little missiles don't land on China by mistake.