All those leaders who flew thousands of miles for the EU-Latin America summit have been upstaged by sideline talks to stop Athens from defaulting on its debts at the end of this month. Can Angela Merkel mend relations between Brussels and the Greek Prime Minister Alexis Tsipras, who in an interview on Tuesday contended that a Grexit would mark the beginning of the end of Europe's single currency? Who's got who over a barrel, and is this where the dream of European integration comes to an end?