Yeah, but now nuclear weapons have come into play.

Think of it like this...

They go to war,
North nukes the south,
South calls on other countries to help,
US (just an example) nukes the North,
North nukes US,
Korea and US are in total war
US allies join in,
Korea allies join in,
World War III,
World destroys itself,



Aliens come and inhabit the earth..