From Reuters:

Four great crises around Europe’s fringes threaten to engulf the European Union, potentially setting the ambitious post-war unification project back by decades.

The EU’s unity, solidarity and international standing are at risk from Greece’s debt, Russia’s role in Ukraine, Britain’s attempt to change its relationship with the bloc, and Mediterranean migration.

Failure to cope adequately with any one of these would worsen the others, amplifying the perils confronting “Project Europe”…