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.