Greece won limited support from the eurozone Monday for the progress it has made in difficult bailout talks but warned that Athens faced a cash crunch within two weeks without a deal.
Athens's radical new government scraped together enough cash to order the repayment to the IMF of 750 million euros ($840 million) and avoid a default which could send it crashing out of the euro.
But eurozone finance ministers meeting in Brussels kept their tough line, saying Greece could not hope for any of the final 7.2-billion-euro tranche of its 240-billion-euro EU-IMF bailout until they make key reforms.
"We welcomed the progress that has been achieved so far... At the same time, we acknowledged that more time and effort are needed to bridge the gaps on the remaining open issues," the Eurogroup statement said after talks in Brussels.
Greek Finance Minister Yanis Varoufakis -- leading the charge for the anti-austerity government of Prime Minister Alexis Tsipras -- admitted that Athens faced an imminent crisis.
"The liquidity issue is a terribly urgent issue. It's common knowledge, let's not beat around the bush," said the shaven-headed former economics professor, who has been at loggerheads with his international counterparts.
"From the perspective (of timing), we are talking about the next couple of weeks."
- Punishing repayments -
Greece faces a punishing debt repayment schedule in coming weeks, owing another 1.5 billion euros to the IMF in June and then another three billion euros to the European Central Bank (ECB) in July and August.
Athens has been squeezing funds from the central and local governments to be able to meet its payments, but mayors are beginning to resist.
Europe's stock markets lost ground earlier Monday as Greece failed to reach a deal while the euro dropped to $1.1141 from $1.1208 late in New York on Friday.
Led by Germany, the Europeans still expect a rigorous regime of reforms from Athens including cuts to pensions, but Tsipras's leftist government in power since January has so far refused to deliver on the terms of the bailout.
Eurogroup chief Jeroen Dijsselbloem insisted that a full deal was needed for Greece to get its remaining bailout funds, but raised the possibility of breaking up the reform programme into steps and then making staggered disbursements.
But the eurozone needed "more detailed proposals" from Greece, the Dutchman said, adding that there was "a lot of work behind the scenes in Athens that needs to be done."
EU economic affairs commissioner Pierre Moscovici said that on issues like pensions and the labour market, Greece had to make "alternative proposals for areas of programme that it rejects."
Varoufakis said he hoped for a deal in coming days.
- Germany floats referendum idea -
Meanwhile Germany floated the idea of a Greek referendum on the government's policy, in a sign that Europe's patience is running short.
"Maybe this would be the right measure to let the Greek people decide if it is ready to accept what is necessary," powerful finance minister Wolfgang Schaeuble said.
Greece was hoping that the symbolic statement of progress won from the eurozone Monday will help persuade the ECB to keep emergency funds flowing to Greece's fragile banks.
"The statement is a clear sign that the process is ongoing, and that's something," a European official involved in the talks said on condition of anonymity. "But will it be enough for the ECB? I don't know."
Tsipras, whose hard-left Syriza party swept to power on an anti-austerity platform, has called for an "honourable compromise," and the government reportedly plans a number of concessions to win over its creditors.
These include a new VAT rate, along with a restriction on early retirement and an unpopular property tax that would enable the government to save billions of euros as demanded by its creditors.