Migrants demand to open the border, during a protest at the Athens' port of Piraeus, Thursday, March 17, 2016. Over 4,000 stranded refugees and migrants stay at the passenger terminal buildings, their tents and a warehouse at the the biggest port of Greece. With European unity fraying in the face of more than 1 million migrant arrivals over the last year, Turkey — the source of most refugees heading to Greece — is seen as the key partner to contain the influx. (AP Photo/Thanassis Stavrakis)
