Simultaneous crises are the new normal. Europe’s leaders must confront a quartet of challenges if they want to prevent the European Union falling apart.
Four horsemen will be circling around this week’s European Council. They represent four crises that threaten the EU: ‘Grexit’; the Mediterranean migration crisis; Russian aggression; and Britain’s threat to leave if the club is not reformed. Any of these issues could dominate the European Council’s agenda: each could alter the fundamental character of the Union. While none of them is particularly new – Greece's economic and financial woes have troubled the EU for six years – they are circling together and affecting each other.

