Germany, Austria, Belgium, Sweden and Denmark will warn today that Greece has six weeks to stop migrants crossing from Turkey or it will be “quarantined” outside the European Union’s borderless Schengen area.

A meeting of European interior ministers will discuss plans for Greece to be sealed off for two years behind a new EU external border in the Balkans.

Northern European countries are frustrated that Greece has opened only one of five refugee processing and detention centres it agreed to set up with EU help. “If the Athens government does not finally do more to secure the external borders then one must openly discuss Greece’s temporary exclusion from the Schengen zone,” Johanna Mikl-Leitner, Austria’s interior minister, told Welt am Sonntag. “It is a myth that