Greek riot police guard as migrants stand on a fence as they try to enter Greece from Turkey at the Greek-Turkish border in Kastanies on Wednesday, March 4, 2020. Facing a potential wave of nearly a million people fleeing fighting in northern Syria, Turkey has thrown open its borders with Greece to thousands of refugees and other migrants trying to enter Europe, and has threatened to send "millions" more. (AP Photo/Giannis Papanikos)
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