War nerd har skrivit en bra artikel om Turkiets relation till IS:
http://pando.com/2015/02/24/the-war-nerd-tomb-raiders-of-kobane/
"Erdogan’s victory in the elections was very convenient for Syrian Sunni Arab rebels, because the long and, as they say, “porous” border between Turkey and Syria can get a lot more porous (think sieve with a big hole punched in it) if the Turkish rulers are in the mood. And Erdgoan’s Islamists, preaching Sunni unity and nursing old grudges against Assad’s Alawite sect, basically installed a JO (“Jihadis Only”) lane along all 1200km of the Syrian border. Turkish border guards’ arms got tired, waving so many Toyota pickups full of heavily bearded young men through the border crossings. Their necks got cramped from nodding like they believed it when the young men in those trucks told them there was nothing but old scrap under the tarp in the truck bed. And, no doubt, their pants pockets got frayed from the wads of cash those well-financed jihadis slipped them to make sure no inconvenient inspections were carried out. After all, ideology isn’t everything, and a border guard without a few coffee cans of cash buried in his yard isn’t really a proper border guard at all.
The Turkish government’s idea was that all these bearded young men from London and Dusseldorf and Tunis and Marseille would overthrow the Alawites, install a friendly Sunni-Islamist Syrian government, a sort of kid brother to Erdogan’s AKP, and Turkey would be the proud owner of a Syrian puppet state without losing a single soldier.."