[Syrian refugees on a dinghy drift in the Aegean sea off the Greek island of Kos in Greece]By Dasha Afanasieva IZMIR, Turkey (Reuters) - Demand has never been higher for the services of Turkish smuggler Dursun, who has taken migrants to Europe for more than decade, and he says nothing short of an army could stamp out his illicit trade. The EU is counting on Ankara to stem the flow of migrants to Europe after more than a million arrived last year, mainly illegally by sea from Turkey, in the continent's worst migration crisis since World War Two. NATO sent ships to the Aegean on Thursday to help Turkey and Greece stop criminal networks smuggling migrants.