The Turks don’t want the immigrants, so they let them pass on through to Greece. The Greeks don’t want them, and are sending them back to Turkey.
Presently, around 3-million-plus Syrian refugees are in Turkey, with another 2-million-plus non-Syrian refugees there.
The vast majority of the five-million are looking for some way of exiting and going to Germany. Turks (at least at the national level) are ambivalent this. They don’t want the refugees but are getting some cash flow from the EU and UN to cover expenses. At local level...various Turkish smugglers exist and for some cash situation, they will take the migrant to the Greek border or some Greek isle...dumping them off.
The old tactic was just to reach Greece, and travel on through to Northern Macedonia, Serbia, Hungary, Austria, and onto Bavaria. Fences are up and the Frontex people (EU’s security) are supposed to prevent movement.
The Greeks got the idea from the good folks at Martha’s Vineyard.
Don’t worry Greece. Your EU overlords will give Turkey the nod to invade you if necessary.
According to the articles that I’ve seen over the past few years, Turkey has been sending or allowing large numbers of Muslim refugees to float to Greece. Greeks are overwhelmed.
If Africa is for Africans, then Europe is for Europeans.
Fix your own dumps.