Calculus has remained the same since the 1950s in the areas that existed. However, it has advanced into other fields of study.
only in paranoid minds of some people... Kim is not - he is just doing his best with cards he was dealt
And what is the difference between war and such behavior as you put it. Is killing of only a handful of SKs in a single missile strike acceptable because it was just a single missile?
sure - just like USA does not mind to annihilate more than a handful civilians to achieve certain goals... war is in NK case as you present means invasion and calculus is different, no matter what you try to imagine on Kim's behalf
You seem to be missing the point the point though. The North was doing these things to test the South's resolve and whether or not we would be there. Fortunately we were, otherwise the North could have very well decided it was time to invade again.
US is not "were", US is "are"... US forces are in SK - so no invasion to SK under current circumstances with NK forces ... but of course if Kim decides that US really wants to take him out then by all means he will be right to nuke Seoul first ... he can't afford not to.
Your comment about wanting an extra million dollars is a red herring by the way, another argument that is a fallacy. Your mental and moral capacity have nothing to do with Kim's.
how do u know ? do I need anything more than pen and paper to take on a bank ? and I am not more smart in the matters of survival than Kim (neither is you) - I bet we both long 'd be gone in NK, and he rules ...
In order to determine whether to not Kim would invade, we need to look at Kim's actions, not yours.
sure, I see only reasonable actions to deter the potential agressor
Insofar as your comments about the USSR and Japan, technically they are not true. The USSR no longer exist, so therefore it can not be at war with Japan.
you tried to omit Russia from that
... and USSR was technically at war with Japan till the last day it formally existed
Not to mention, it is pretty obvious that Putin is a rather shrewd leader that makes well thought out decisions, which I accept even if I don't agree with some of them. Kim I am not so sure about. He seems either unstable or power hungry; neither are good qualities for a leader of a nuclear nation.
it takes more to rule, survive and deter USA in NK for Kim that for Putin to do the same in Russia ...