Eurozone clinches deal with Greece in marathon summit

"Euro summit has unanimously reached agreement. All ready to go for ESM programme for Greece with serious reforms and financial support," European Council President Donald Tusk announced on Twitter, referring to the European Stability Mechanism bailout fund.

The tough conditions imposed by international lenders led by Germany could spell trouble for thegovernment of Prime Minister Alexis Tsipras that was elected under an anti-memorandum, anti-austerity leftist platform and will cause an outcry in Greece among those wishing a 'divorce' from the single currency. Even before the final terms were known, the Greek labour minister went on state television to denounce the terms.

"We were able to keep the unity on keeping Greece inside the euro zone," Slovenian Prime Minister Miro Cerar said on his Twitter account.

EU officials said Tsipras finally accepted a compromise on German-led demands for the sequestration of Greek state assets to be sold off to pay down debt. The terms of the agreement were not immediately known.

The Greek leader also dropped resistance to a full role for the International Monetary Fund in a proposed 86 billion euro ($95.78 billion) bailout, which German Chancellor Angela Merkel has declared essential to win parliamentary backing in Berlin.

However, in a sign of how hard it may be for Tsipras to convince his own Syriza party to accept the deal, Labour Minister Panos Skourletis said the terms were unviable and would lead to new elections this year.

Over the long hours overnight, most of the leaders were forced to cool down, playing computer games or taking a nap in their delegation offices while Tusk and the leaders of Germany, France and Greece met several times privately to try to cut through the final knots.

Tsipras will now have to rush swathes of legislation through parliament this week to convince his 18 partners to release bridging funds to avert a state bankruptcy and just to begin negotiations on a three-year loan.

If the summit had failed, Greece would have be staring into an economic abyss with its shuttered banks on the brink of collapse and the prospect of having to print a parallel currency and in time exit the European monetary union.

Six sweeping measures including spending cuts, tax hikes and pension reforms must be enacted by Wednesday night and the entire package endorsed by parliament before talks can start, the leaders decided.