In Greek crisis, one big unhappy EU family

Greek Prime Minister Alexis Tsipras arrives for a parliamentary session in Athens, Greece July 16, 2015. REUTERS/Alkis Konstantinidis

BRUSSELS (Reuters) - The latest paroxysm of Greece's debt crisis has exposed growing rifts in the euro zone which, unless addressed soon, could lead to the break-up of European monetary union, the EU's most ambitious project.

The most worrying sign for European leaders is that public opinion and domestic politics are pulling them increasingly in opposing directions - not just between Greece and Germany, the biggest debtor and the biggest creditor, but almost everywhere.