Greece's Prime minister Alexis Tsipras addresses reporters upon his arrival at the European Council headquarters for an extraordinary summit of European leaders to deal with a worsening migration crisis, on April 23, 2015 in Brussels. European leaders gather on April 23 to consider military action, at an extraordinary summit to deal with a worsening migration crisis after a series of deadly shipwrecks in the Mediterranean.    AFP PHOTO / PHILIPPE HUGUEN        (Photo credit should read PHILIPPE HUGUEN/AFP/Getty Images)