Someone PLEASE post a link to a save file just before the Korean war starts so I can figure out exactly what is going on. Something obviously got lost in the translation of the mod to AOD. Most likely some AI files need fixing. Due to structural changes in AOD I cannot simply copy everything over. Just go back to your last autosave if the war has already started. If you have Vista or windows 7 the savegame file is in "Compatibility files".
As for 1990 I plan to take things one thing at a time. The first thing is to debug the Korean War, so that I can get to 1956 for the Sinai War. Then 1962 Cuban Missile Crisis. Then about 1975 (Indochina --> communist), etc.
Korean war is supposed to be a proxy war, with events to create divisions, a standoff and Chinese intervention. It's only supposed to be WW3 if the USA makes an ahistoric choice and then there are usually nukes exchanged between the USA and USSR.
NATO and Warsaw pacts may not be created in full historic detail. I'm assuming the alliances exist in prototype form since 1945.
The Nuclear Rules will generally prevent nuclear war in the cold war era unless the US and USSR get in an open war. For other "cold wars" the "loss of territory or enemy authorizes first" rule applies. Example--if the Arabs succeed in taking some territory from Israel they will use nukes if they have them.
And before anyone asks again, in the unlikely event that the Arabs choose open war in 1948 but get one of their countries annexed, I will have Israel release puppets as soon as the war is over--UNLESS their government is fascist. As Israel is democratic upon release, that is extremely unlikely, and will only happen if someone does a savegame, reloads as Israel and plays with the sliders. In that case the USER WHO DOES THAT will have the responsibility for reconciling his actions with reality. That will be in 0.15. This is not accounted for as of yet, so I suggest if that happens just load as Israel and release a puppet manually or write your own event.