Trump must be very careful with his political moves from now on. But the WW3 is coming soon, and I don't know if anyone can stop it. North Korea isn't playing, and I don't know if Americans have understand the power North Korea has.
The Americans have always underestimated the military power of their enemy, and have overestimated their own military power. This has happened countless times, especially with Vietnam, Iraq, Libya, and Afghanistan.