Here is a piece on the EU, sort of ranking the challenges

Greece Has One Foot Out EU Door, But It Is Italy Where Concern Should Be Focused

It opens:

  • It is difficult to determine which is the most significant market concern coming out of the European Union. While mainstream eyes appear focused on the French election outcome, reports from Bank of America Merrill Lynch point to concerns in the Netherlands. Add to this general populist market anxiety a new Source report notes concern in France but more specifically Italy, and the EU might devolve into a political mess that could impact markets.

None of this should be new news to anyone. But still worth a quick read.