The way you mentioned the flashpoints feels forced. I'd much rather have some sort of spiraling descent that gives the whole mod an undertone of hopelessness and the inevitability of war and strife.
it should be centred around the need for resources and food i presume most the the flashpoints will be in (Korea, Iran, Taiwan, Kosovo, arab uprising etc) so I'm bringing something new :
The Euro has collapsed but NATO has barely scrapped through, the UN is missing the Russian alliance and all of the Chinese Alliance except China itself, China is just there to mock the USA.
after one of the obvious flashpoints cause war, or an arms race then war food should cause chaos, think about what would happen if trade collapsed and nations found themselves without food. Is that dark enough for you Kaiser
India, China, Japan, UK, Africa Caribbean, Mediterranean islands, Latin America, South Europe, USA. Those are the flashpoints of the new food crises. These nation would suffer the worst through a trade/food collapse and so i'll write my thoughts on them. In order of what will happen, this will probably begin to occur in the second year of WW3.
Africa : South Africa finds it's population isn't sustained by it's food, but it's neighbours think that they are going hungry as South Africa is plentiful with food. The surrounding nations ally together to destroy it, after doing so they find that it it isn't as rich as it thought and so they attack each other thinking that if they unify the south of the continent they will be fine for food. Thousands die in the conflict.
The area of Kenya echoes the same story barely weeks after South Africa is defeated. Their neighbours tare it apart then proceed to destroy each other.
Nigeria and Ghana ally with each other to prevent themselves from being victims like Kenya and South Africa. They instead assault their neighbours and unify the coast from Gambia to the Congo. The rest of the African nations all battle each other for complete control over the continent. The rest of the world turns a blind eye as they watch their food stocks shrink as the war escalates.
At this point Russia has Belarus, Ukraine, Georgia, Kazakhstan(and all other 'stans' except Turkmenistan) under it's control. Finland and the Baltic states have allied for it in return for food while Serbia (who has seized Kosovo) has been allied to it for the whole war, Greece is also allied to it after the Russians backed their taking of F.Y.R Macedonia. These nations have enough food to get by and will go on a gradual conquering spree. Turkey has been defeated by Kurdistan which owns all of central and north Iraq aswell as south east Turkey. Israel owns Jordan, South Lebanon and the land up to the Suez canal.The arabian peninsula is one nation (arab federation) which is all of the peninsula including Basra and Iraq up to Baghdad.
Indochina becomes chaos as Vietnam invades Laos and Cambodia and Thailand attack each other thinking that they have enough food to save them. As this happens after about 1 year 4 months of war an Indian poll finds the world death toll to be around 150million through lack of food. This information is what will ruin the world. As the information is released Riots spring up throughout the world. (in game players will get to choose how they react to them). Most countries to to contain it, Dictatorships just gun down the protesters as they are wasting food anyway. China and America make peace as food is depleted in both nations. Western China tries to join Mongolia who is getting by with food imports from Russia. China allows i as Riots spread across major cities, Southern China becomes independent after three months of hunger, the Chinese civil war will be swift and deadly. One China will win with over 300million killed. They will invade Japan who is a starving nation. After seizing Nagasaki and Kagoshima Japan makes peace and allies to China in return for food. South Korea is left abandoned and is quickly destroyed by the north.
At the same point in the civil war in China the UK will dissolve as riots spread throughout the nation. The four nations of the British isles will trade successfully for food but all foreigners will be forced into southern Yorkshire by angry natives thinking that their food is being stolen. a brief English civil war is fought where the republic of Britain which is completely dominated by non natives trying to take control of the countryside (This could be event driven). The citizens of the Isles are content to trade amongst themselves and the loyal members of the commonwealth (Canada, Australia, Caribbean). The commonwealth stays intact and peaceful for now. (there could be more anti foreigner movements across the world)
France struggles against communist uprisings in Italy, Spain and Portugal. The normally neutral Swiss join the French cause for food that the French never supply. France's dissent will constantly rise during the war until it collapses under rebellion. A man rises and calls himself emperor of the French 2nd empire. It seeks to unify France, Italy and Iberia (Spain/Portugal). They also take Switzerland. As the communists lose they call on Germany for help. Germany had recently recovered from an attempted coup then a civil war with Bavaria/Austria. It takes the opportunity to invade Belgium and hand it over the The Netherlands in return for an alliance. Denmark, Norway and Sweden form the Scandinavian union during their war with Russia. Poland falls to Russia before the it invades Sweden and triggers the union formation.
A new poll by a Brazilian intelligence suggests the death toll from lack of food is at 400million. This causes an invasion of the food rich Argentina who has peacefully annexed Chile with food offerings.
India doesn't know what to do, they invade Pakistan and trigger the third nuclear strike of the game (The first is Iran to Saudi, the Second is NATO to Wonsan to prevent a N.Korean nuke launching.) Pakistan is quickly destroyed and revenge is taken on them by the Indians, no food is given to the Pakistani's and all of it is taken to India. India then does the same to Burma and Afghanistan. Kurdistan has a disagreement with Iran which results in war. (This is a non food driven war.)
I could go on, but basically there could be a civil war in the USA eventually, with Texas, Pacific states and Confederacy declaring independence. The pacific states should be the most powerful. (ALL US soldiers return home when the first food poll is released.) Eventually China will annex Hawaii with food offerings and Invade the Pacific states which will look to the USA for aid, the PSA will collapse but Utah, Nevada and New Mexico don't want to reunify so form the nation of Deseret which was rejected years ago by the USA. Deseret is neutral in the 2nd war between China and the USA. At some point every ex NATO nation will have to rejoin to battle Russia and China when they have a disagreement over west China which is still under Mongol rule. They will make war with Mongolia and eachother which will be when NATO will strike back, this time though there could be a massive empire in Africa, an other nations like Israel, Arab federation, Iran, India and Latin America could make a difference one way or another.(before this though there will be many more food wars that may include more nukes.)