A man from the middle rises through the ranks and brings peace to the middle east. The western world celebrates and embraces this person/regime/President (of Syria, Saudi Arabia, UAE...whoever) and through the peace in Iraq and Afghanistan and Pakistan and Africa via the Muslim faith.
Western leaders gather in Syria, Saudi Arabia, UAE...where ever (like the G20, but bigger) for peace. BIGGEST THING EVAAAR.
They are taken out. It's a Jihad end game move on a global scale by Fundimentalist nations loyal to Sharia that's been coordinated while we've been distracted by Afghanistan and Iraq. Israel is gone. Pakistan is taken. Within a week up to 200 nukes have taken care of the States (how?), Canada, Alaska, Russia, much of Europe, England, China.
The purpose is to attempt to make the world Sharia run. Islamic Asia, Africa, Middle East, Eastern Bloc, etc etc do it. Northern Australia is gone. American navy is left with PT boats and under. Maybe some subs left.
They've used the lost nukes from the Russian fall, lost (actually) in the Ukraine. Lower South America survive. Pacific Nations, excluding Hawaii, most nations have lost the military ability to resist on a worthwhile scale.