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Greece has missed the deadline for a €1.6bn (£1.1bn) payment to the International Monetary Fund (IMF), hours after eurozone ministers refused to extend its bailout.
But the ministers said they would discuss a last-minute suggestion from Greece for a new bailout programme.
Greece is the first advanced country to fail to repay a loan to the IMF and is now formally in arrears.
There are fears that this could put Greece at risk of leaving the euro.
The IMF confirmed that Greece had failed to make the payment, shortly after 22:00 GMT on Tuesday.
"We have informed our Executive Board that Greece is now in arrears and can only receive IMF financing once the arrears are cleared," said IMF spokesman Gerry Rice.
Mr Rice confirmed the IMF had received a request from Greece to extend the payment deadline, which he said would go to the board "in due course".
With the eurozone bailout expired, Greece no longer has access to billions of euros in funds and could not meet its IMF repayment.
The European Central Bank (ECB) has also frozen its liquidity lifeline to Greek banks. Meanwhile, ratings agencies have further downgraded the country's debt.
Analysis: Chris Morris, Europe correspondent
This is not how international diplomacy or finance is supposed to be conducted: a series of confusing last minute proposals in an atmosphere of mounting chaos.
Without another bailout, Greece is in dire straits. Cut off from all international financing, and skating on dangerously thin ice.
If it can't repay a debt to the ECB on 20 July, that would probably be the end. It is running out of options to keep it in the eurozone.
Part of the new deal Greece has suggested would involve a restructuring of its huge debts - but some of its proposals will not be acceptable to other eurozone countries. So there is uncertainty at every turn, and plenty of public posturing as Greece prepares for a referendum on Sunday.
Just to confuse matters still further, some EU officials have suggested that there have been indications from the Greek authorities that if the outlines of a deal can be done in the next couple of days, the referendum could even be cancelled.
New bailout 'considered'
Eurogroup chairman and Dutch Finance Minister Jeroen Dijsselbloem earlier said it would be "crazy" to extend the Greek bailout beyond its Tuesday midnight expiration as Athens was refusing to accept the European proposals on the table.
Speaking after the conference call with other eurozone ministers, he added that a Greek request for a new €29.1bn European aid programme would be considered in a meeting on Wednesday.
Greece's left-wing Syriza government, elected on an anti-austerity platform, has been in deadlock with its creditors for months over the terms of a third bailout.
What happens next?
30 June - Greece failed to meet deadline for €1.6bn repayment to the IMF.
5 July - The referendum on creditors' proposals, and many say Greece's membership of the eurozone, takes place.
20 July - Greece must redeem €3.46bn of bonds held by the European Central Bank. If it fails to do so, the ECB can cut off Greece's access to emergency loans.
The European Commission - one of the "troika" of creditors along with the IMF and the eurozone's European Central Bank - wants Athens to raise taxes and cut welfare spending to meet its debt obligations.
Ratings agency Fitch cut Greece's credit rating from "CCC" to "CC" on Tuesday evening, which is one level above a full default.
It comes amid fears of a default on Greece's huge public debt of €323bn, with people queuing at cash machines. Withdrawals are capped at just €60 a day.
Greek banks did not open this week after talks between Greece and its creditors broke down. However, up to 1,000 bank branches will re-open from Wednesday to allow pensioners - many of whom do not use bank cards - to withdraw up to €120.
On Tuesday evening, thousands of pro-EU protesters braved stormy weather and gathered outside the Greek parliament in Athens to urge a "yes" vote in a referendum on Sunday over whether the country should accept its creditors' proposals.
It follows a similar demonstration by those advocating a "no" vote - the path preferred by Mr Tsipras - on Monday.
EU leaders have warned that a no vote rejecting creditors' proposals would mean Greece leaving the eurozone - though Mr Tsipras says he does not want this to happen.
The ECB is believed to have disbursed virtually all of its emergency funds for Greece, amounting to €89bn (£63bn).
Source: http://www.bbc.com/news/world-europe-33339363