Trail

The EU made a contract with Turkey about "returning" refugees from Greece and keeping future ones from their island. Well, not even beginning to talk about how much it disregards international conventions they hold up in high esteem if it suits them and that it qualifies for the term "human trafficking" - a look on the map should give you another error in this wannabe-"well thought out" plan.
They always told how much they don't want those people that come from the Balkans, but where are the Balkans? Are they East and South of Turkey? No, they aren't.
Who comes from the Balkans doesn't need to go via Turkey. He already is positioned far ahead on the route. And just returning them to their homey countries doesn't make them not reappear again, as practice shows. Who stops you in these states after what the NATO has left of Yugoslavia? It is rather likely you find help in this over there because of the powers the West liked to work together with in this conflict.
So, what use is it to lock out only those refugees which flee from the warzones you created, when just a big chunk of those who also want to come already sit far behind that border you're trying to close?
Much more, if you don't have the personnel and the time to get a hold of dispatching these?