The EU has promised $800m to Greece to deal with a refugee and migrant surge from Turkey. That came after Turkey said it would allow hundreds of thousands of people to pass through.
Greece and Bulgaria have stepped up security on their side of the land border with Turkey.
The Greek coastguard is now actively repelling boats trying to get to its islands across the Eastern Mediterranean.
Ankara's decision to open the borders breaches an agreement it made with the EU in 2016 to resettle refugees and stop them from crossing into Europe
Turkey now hosts more than four million refugees and says it cannot cope with any more people fleeing the latest violence in Idlib.
Following the opening of the Turkish side of the border, which came hours after the killing of dozens of Turkish soldiers in Syrian government air raids, footage showing refugees trying to cross sea and land into neighbouring Greece has been widely shared. – Subscribe to our channel: http://aje.io/AJSubscribe – Follow us on Twitter: https://twitter.com/AJEnglish – Find us on Facebook: https://www.facebook.com/aljazeera – Check our website: https://www.aljazeera.com/ #AlJazeeraEnglish #EU #Refugees #Turkey