EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Greek Prime Minister Alexis Tsipras (R) shares a joke with Parliament Speaker Zoe Constantopoulou (L) and other lawmakers before a ruling Syriza party parliamentary group session in Athens, Greece July 15, 2015. Tsipras battled to win lawmakers' approval on Wednesday for a bailout deal to keep Greece in the euro, while the country's creditors, pressed by the IMF to provide massive debt relief, struggled to agree a financial lifeline. REUTERS/Yannis Behrakis TPX IMAGES OF THE DAY 

Greece's Prime Minister Alexis Tsipras arrives at a euro zone leaders summit in Brussels, Belgium, July 12, 2015. Euro zone leaders will fight to the finish to keep near-bankrupt Greece in the single currency on Sunday after the European Union's chairman canceled a planned summit of all 28 EU leaders that would have been needed in case of a "Grexit". REUTERS/Francois Lenoir

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Greek Prime Minister Alexis Tsipras delivers a speech at an anti-austerity rally in Syntagma Square in Athens, Greece, July 3, 2015. Tsipras, elected in January on a promise to end six years of austerity, extolled a packed Syntagma square in central Athens to spurn the tough terms of an aid deal offered by international creditors to keep the country afloat. REUTERS/Yannis Behrakis TPX IMAGES OF THE DAY 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Greek Prime Minister Alexis Tsipras smiles before a ruling Syriza party parliamentary group session in Athens, Greece July 15, 2015. Tsipras battled to win lawmakers' approval on Wednesday for a bailout deal to keep Greece in the euro, while the country's creditors, pressed by the IMF to provide massive debt relief, struggled to agree a financial lifeline. REUTERS/Yannis Behrakis 

Greece's Prime Minister Alexis Tsipras (2nd L) talks to European Commission President Jean-Claude Juncker and France's President Francois Hollande (R) next to Belgium's Prime Minister Charles Michel (L) during an euro zone leaders summit in Brussels, Belgium, July 12, 2015. REUTERS/Francois Lenoir

Greek Prime Minister Alexis Tsipras arrives at his office in Maximos Mansion in Athens, Greece, July 13, 2015. Euro zone leaders agreed on a roadmap to a possible third bailout for near-bankrupt Greece on Monday, but Athens must enact key reforms this week before they will start talks on a financial rescue to keep it in the European currency area. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY

Greek Prime Minister Alexis Tsipras gestures as he attends a parliamentary session in Athens, Greece, July 10, 2015. Greek Prime Minister Alexis Tsipras appealed to his party's lawmakers on Friday to back a tough reforms package after abruptly offering last-minute concessions to try to save the country from financial meltdown. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

Greek Prime Minister Alexis Tsipras arrives in his car at a euro zone leaders summit in Brussels, Belgium, July 12, 2015. Euro zone leaders will fight to the finish to keep near-bankrupt Greece in the euro zone on Sunday after the European Union's chairman cancelled a planned summit of all 28 EU leaders that would have been needed in case of a "Grexit". REUTERS/Philippe Wojazer 

Greek Prime Minister Alexis Tsipras checks a mobile phone during a voting session at the Parliament in Athens, Greece, July 11, 2015. The Greek parliament voted overwhelmingly on Saturday in favour of authorizing the left-wing government of Tsipras to negotiate with international creditors on the basis of a reform programme unveiled this week. REUTERS/Christian Hartmann

Greek Prime Minister Alexis Tsipras delivers a speech at an anti-austerity rally in Syntagma Square in Athens, Greece, July 3, 2015. Tsipras rejects claims that Greeks will be deciding on their future in the euro zone in a referendum on Sunday, saying negotiations will continue for a better deal with lenders after the vote. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY 

Greek Prime Minister Alexis Tsipras arrives to attend a parliamentary session in Athens, Greece, July 10, 2015. Greek Prime Minister Alexis Tsipras appealed to his party's lawmakers on Friday to back a tough reforms package after abruptly offering last-minute concessions to try to save the country from financial meltdown. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

Greek Prime Minister Alexis Tsipras is pictured before his speech at a parliamentary session to brief lawmakers over the ongoing talks with the country's lenders, in Athens, Greece June 5, 2015. Tsipras on Friday branded a cash for reforms proposal by his country's creditors an "absurd" one that he cannot accept and said he hoped it would be taken back. In an uncompromising speech to parliament, Tsipras said a proposal by Athens made earlier this week was the only realistic basis for a deal with creditors. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

Greek Prime Minister Alexis Tsipras arrives at a euro zone leaders summit in Brussels, Belgium, July 12, 2015. Euro zone leaders will fight to the finish to keep near-bankrupt Greece in the euro zone on Sunday after the European Union's chairman cancelled a planned summit of all 28 EU leaders that would have been needed in case of a "Grexit". REUTERS/Philippe Wojazer 

Greek Prime Minister Alexis Tsipras reacts during a voting session at the Parliament in Athens, Greece, July 11, 2015.The Greek parliament voted overwhelmingly on Saturday in favour of authorizing the left-wing government of Tsipras to negotiate with international creditors on the basis of a reform programme unveiled this week. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY

Greece's Prime Minister Alexis Tsipras addresses a news conference after an European Union leaders summit in Brussels February 12, 2015. REUTERS/Francois Lenoir (BELGIUM - Tags: POLITICS BUSINESS TPX IMAGES OF THE DAY)