WWIII:
Right now we have what is in my opinion, a couple of razor-thin delicate situations that have been going on in the world; all it would take is one small but significant scenario to cause the shit to hit the fan.
Phase I: China vs. Taiwan and Allies
If the right president is elected, one who would have the balls to do so, he declares the island independent. China invades, drawing the U.S. into Taiwan to defend it, via the mutual protection pact. Japan and Australia side with the U.S. China launches a missle barrage onto the island, devastating major military outposts. The U.S. Navy engages with the Chinese Navy in it's waters. This battle is open to interpretation, but the U.S. would probably take the Chinese in a naval war and send planes into the mainland to take out more military targets.
Phase II: Israel and Allies vs. Everyone Else
Israel and Palestine fail to reach a formal agreement and all hell breaks loose when the IDF moves in to seal the territory. Iran, keeping with it's commitment to "wipe Israel off the map" launches an offensive. Syria sides with them in the engagement. Iran moves to cut off oil shipping routes and meets with the U.S. Fifth fleet. A coalition is created among various E.U. nations and the U.S. as they move in to "neutralize" the conflict.
Phase III: India vs. Pakistan
A misunderstanding takes place when a border conflict skirmish turns into all-out war as both sides begin threatening to launch nukes at each other.
Meh, I'm too tired to type out much more, but for Phase IV I would have included South America. Venezuela initiating something causing the shit to fly, yada yada. The only thing I left out is what Russia will be doing during all of this. Who's side would they take. The Chinese? Nato? pft...probably not...
M.A.D. anyone?