Greece's prime minister presented new proposals to European leaders Sunday aimed at ending his country's debt crisis, as Athens announced a frenzied round of meetings ahead of a summit that could determine whether Greece crashes out of the eurozone.
In a telephone call with German Chancellor Angela Merkel, French President Francois Hollande and European Commission President Jean-Claude Juncker, Alexis Tsipras detailed a "mutually beneficial deal", the Greek premier's office said in a statement.
The flurry of diplomatic contacts came as Athens scrambled to reach a deal with its eurozone lenders after five months of deadlock, with Tsipras also scheduled to meet the leaders of its IMF, EU and ECB creditors on Monday before the summit.
Italian Prime Minister Matteo Renzi urged the two sides to seize a "window of opportunity", saying all conditions were in place for them to reach a "win-win accord".
Athens said its new proposals were aimed at reaching a "definitive solution" to end the standoff between Athens and its creditors as fears deepened over a potential "Grexit" from the eurozone.
The heads of the 19 eurozone countries will hold an emergency summit on the crisis in Brussels on Monday under pressure to prevent Greece from defaulting on its debt with a June 30 payment deadline fast approaching.
The head of the European Commission cabinet Martin Selmayr described the Greek proposals as providing a "good basis for progress" at the summit, and alluded to the difficulties in striking a deal by terming the process a "forceps delivery".
Separately, the European Central Bank's governing council will also meet on Monday morning to discuss whether to raise the level of emergency funding to Greek banks yet again, after the country's banking system came under intense pressure with clients withdrawing massive sums in savings.
Underlining the growing concern beyond Greece, several thousand demonstrators gathered in Brussels on Sunday and several hundreds in Amsterdam to plead for solidarity with the cash-strapped country on the eve of the make-or-break summit.
In Athens itself, more than 7,000 people took to the streets for the second time this week to protest against austerity and voice support for the Syriza-led government. Demonstrators carried banners that read "A different Europe with Tsipras" and "You can't blackmail the people, the country is not for sale".
- 'Sanity will prevail' -
The head of Greece's biggest bank said she thought "sanity will prevail" and lead both sides to a deal.
"To enter into such uncharted waters and take up all the risk both for the eurozone and for Greece for two or three billion (euros) difference, I think it's insane," National Bank of Greece chief Louka Katseli told BBC radio.
Greece's anti-austerity government met Sunday to refine its proposals, while a European source said Tsipras and Juncker held talks over the weekend, adding that there were many exchanges and "informal work under way to find a solution".
Failing a deal, Greece is likely to default on an IMF debt payment of around 1.5 billion euros ($1.7 billion) due on June 30, setting up a potentially chaotic exit from the eurozone.
Last Wednesday the Greek central bank put the risk in stark terms saying: "Failure to reach an agreement would... mark the beginning of a painful course that would lead initially to a Greek default and ultimately to the country's exit from the euro area and -– most likely -– from the European Union."
The IMF was called in to help rescue Greece at the end of 2009 when the debt-plagued country could no longer borrow on international markets.
The EU's involvement in the huge bailout, which was to provide 240 billion euros ($270 billion) in loans in exchange for drastic austerity measures and reforms, runs out at the end of this month, but IMF support was supposed to continue to March 2016.
Talks between Greece's radical-left government and its lenders have been stalled over disagreements over the reforms demanded in exchange for the final 7.2 billion euro tranche of the bailout, with talk also turning to an extension of the European help.
For the Greek government any extension of the bailout should be about kickstarting the country's devastated economy and not further austerity.
They also want an easing of the country's crippling debt burden, which officially stood at 312.7 billion euros, or 174.7 percent of gross domestic product, in March.
The international lenders have rejected a series of proposals from Athens, insisting on their own mixture of cuts and reforms.
Minister of state Nikos Pappas, who is close to Tsipras, said the counter-proposals would be "unacceptable to whichever Greek political party" was in power.
- 'Bridging the gap' -
Alekos Flambouraris, another Tsipras minister, said Saturday that Athens would propose reworked measures that "bridge the gap", while also predicting that Greece's creditors would not be satisfied with the gestures, Greek media reported.
"You'll see they won't accept loosening budget (restrictions), or our proposal on the debt," he said of two main sticking points in the talks.
But the country's Finance Minister Yanis Varoufakis, whose flamboyant style has irked many of his European counterparts, turned the tables by putting the onus on the leader of paymaster Germany to do a deal.
"The German chancellor has a clear decision to make on Monday," he wrote in an op-ed for the Frankfurter Allgemeine Zeitung.
"On our side, we will come with determination to Brussels to agree to further compromises as long as we are not asked to do what the previous (Greek) governments have done: accept new debt under conditions that offer little hope for Greece to repay its debts," he wrote, without specifying the compromises.