Here's my 2 cents.
Israel will invade Gaza, Gaza will call on Iran for aid, Syria will aid Iran and Gaza, Turkey will attack Syria as they've been at a few skirmishes the past few monthes. Turkey, being a part of NATO will further increase pressure for Germany, UK, France, USA, Canada etc. to send troops over for whatever it maybe, (most likely just peacekeeping.)
Then, someone hits a NATO observer and WW3.