[A woman carries a child as refugees and migrants disembark a rubber boat upon arrival at the northern island of Lesbos after crossing the Aegean sea from Turkey, in Mytilene, on February 23, 2016]A diplomatic spat between Greece and Austria on Tuesday highlighted the deepening rifts among European states about how to tackle the migrant crisis as new figures showed no let-up in the influx of people fleeing war and poverty.