Don't think Kim and his crew really thought his plan out, the only possible allies for North Korea are Russia and Cuba, and I believe Bulgaria or something, Many would say China is a threat but China only cares about their Trading alliances, and will most likely join the winning side, if they even need to join IF there is war in the first place. Further more, There are very few places in which North Korean Missiles could reach Claimed by the United states, Hawaii and Alaska I believe are the only two and a possible California, their weapons aren't very advanced, and if they do plan to launch a nuclear attack the missiles will be shot down but I believe that the retaliation will not be with nukes but with smaller missile types or an invasion of the country to protect the lives of the innocent in North and South Korea.

but, you never know until it happens.

Yes does anyone here know more about how they intercept warheads?

Yes definitely, they will have rapid response light weight missiles that are faster than the heaver warhead carrying long range missiles that can take it down. However these socalled defensive systems are also stocked with nuclear response long range war heads. Multiple even, so as soon as its launched a counter will be sent out. Putin is actually quite annoyed by the fact that they're put in Romania since that is currently putting the equal force unequal and therefor making MAD an invalid system that doesn't work. Putin addressed this subject quite properly in a recent interview.





https://www.youtube.com/watch?v=kqD8lIdIMRo

Anyone that aligns themselves with NK after an attack by them would be immediately become an international pariah. China's wary of them already (after having to justify their relationship after all these previous tests and threats), and Putin's too much of a realist to side with them. No need to worry about the possibility of a world war or anything.

If a war broke out there might be some damage done to SK, but I don't think war is likely. Like every other time, this is just posturing. Kim Jong-Un is trying to appear to be a strong leader to his people - If he is seen as weak, dissent would grow and there would be challenges to his leadership. Assuming he's not balls-to-the-walls retarded, he understands it'd be suicide to go to war.

tl;dr - We've got nothing to worry about unless Un is an emotional madman who disregards the advice of all his advisors.