I think WW3 is almost upon us.
Worst case scenario:
Iraq resistance goes quiet for a while, needing to re-group and re-orginize after loosing thier base in Falujah.
Iran continues to enrich uranium, eventualy leading America to conclude that the only option is militiary intervention.
Meanwhile the opposition party in Ukraine grow stronger - militiary may join the opposition party. Russia, who need a pro Moscow government to gaurantee oil, gas, militiary co-operation (especialy naval) gives Ukraine government its backing and announce that any western intevention is unacceptable. Washington gives the Ukraine opposition its backing and announces that intervention from Moscow is unacceptable.
Israel carries out pre-emtive airstrikes angainst Iranian nuclear facilities. Iran retaliates with it's long range missiles(conventional warheads). Inteligence shows that Iranian neclear program was not destroyed and they may be close to making a bomb. Things seem under control in Iraq now so USA invade Iran to ensure complete destruction of Iranian nuclear program (to the Arab world it seems America is only invading Iran to help Israel).
Iraq resistance (now re-grouped, re-organized and facing a much smaller US force) gets stronger and takes complete control of various Sunni Arab cities. Iraqs majority sh'ite(sp??) totaly oppose the invasion of Iran (although the Iraq government back it) - Sistani declares a Jihad against invaders, sh'ite & sunni unite in a single goal which leaves 200,000 American troops slap bang in the centre of a War facing an enemy number at least 1 million to the west(Iraq) and at least 1 million to the east(Iran). They pull troops from anywhere they can (Afghanistan, Korea) and instigate a draft back at home.
North Korea realise this is the best opportunity they'll get to re-uinte Korea under a communist flag, so they invade Soth Korea. China has the same idea and invade Taiwan.
Moscow intervenes in Ukraine.
Now Europe & Australia realise that although they don't agree with American aggresive foriegn policy that they can't sit on the fence while the world burns, so (knowing which side thier bread is buttered on) they join America to help fight on the many fronts opening up (a draft also seems likely).
Egypt, Syria, Saudi Arabia & Israel probably gonna join in the ruck. Possibly Pakistan and India migght nuke each other too.
Best Case scenario:
A big meteor hits us and saves us the trouble of blowing each other up.
Just thought I'd chear you all up
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