[ATHENS] The Greek central bank warned for the first time on Wednesday that the country could suffer a "painful" exit from the eurozone and even the EU if it fails to reach a bailout deal with international creditors.
The warning came as negotiations over the release of the last 7.2 billion euros (S$10.9 billion) in rescue funds from Greece's massive international bailout remained deadlocked, with payment deadlines looming.
All eyes are on a meeting of the 19 eurozone countries to take place Thursday in Luxembourg, but several officials including Greek Finance Minister Yanis Varoufakis said they were not expecting a breakthrough in the cash-for-reforms standoff there either.
Asked during a visit to Paris whether he thought an accord could be reached at the meeting of eurozone finance ministers in Luxembourg, he said late Wednesday: "I don't think so. Now it is up to political leaders to arrive at an accord."
Underscoring mounting fears of a possible "Grexit", US Federal Reserve Chair Janet Yellen warned that the global economy could see significant turmoil if Greece and its creditors failed to do a deal.
"This is a very difficult situation. In the event that there is not agreement I do see the potential for disruptions that could affect the European economic outlook and global financial markets," Ms Yellen said.
Elected on an anti-austerity platform in January, Greek Prime Minister Alexis Tsipras warned on Wednesday that an EU "fixation" on pension cuts would scupper any hopes of reaching an agreement to avert a catastrophic default.
"There is no room for further cuts without affecting the core of the (pension) system," Mr Tsipras said after meeting with visiting Austrian Chancellor Werner Feymann, one of the few European leaders supporting Greece in the talks.
"This insistence on cutting pensions is incomprehensible," Mr Tsipras said. "If Europe insists on this incomprehensible fixation... it must accept the cost of a development that will benefit no one in Europe."
In one of the starkest warnings so far from a Greek institution, the Bank of Greece said 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 central bank said that if the country left the 19-strong group of countries using the euro it would lead to a deep recession, dramatic declines in incomes and a spike in unemployment in the southern European nation.
It also said Greek bank deposits had fallen by nearly 30 billion euros between December and April, to 128 billion euros.
To help the banks cope, the European Central Bank increased its emergency liquidity assistance by 1.1 billion euros.
The Athens stock exchange fell 3.15 per cent on Wednesday, its fourth straight day in the red.
Mr Tsipras said his hard-left Syriza government had gone as far as it could in meeting the demands of the International Monetary Fund, European Union and European Central Bank for tax hikes and pension reform in return for bailout funds.
As the clock ticked down to key June 30 repayment deadlines, the head of the eurozone countries, Jeroen Dijsselbloem, said he was still working to keep Greece within the fold.
But the mounting pressure has frayed tempers, illustrated by a public falling out in recent days between Tsipras and European Commission chief Jean-Claude Juncker, who has accused the Greek premier of misleading Greek voters about the talks.
Both men briefly spoke by phone on Wednesday, a European official told AFP, in what was their first contact since Sunday. They agreed to talk again "in coming days", the source added.
Greece is due to make a 1.6 billion euro payment to the IMF at the end of the month, with another 6.7 billion euros due to the ECB in July and August - payments that Greek officials say they cannot afford.
With his creditors saying his reform proposals are insufficient, Tsipras on Tuesday accused creditors of trying to "humiliate" his country.
Polls show most Greeks support the government's negotiating strategy, though its approval rating has steadily fallen in recent months.
Some 7,000 people gathered in Athens on Wednesday evening to protest against the creditors' demands for further cuts, police said.
In a show of support for the government, protesters carried banners reading: "End Austerity" and "Democracy, Not Blackmail".
Tsipras is set to travel to the St Petersburg International Economic Forum on Thursday and is scheduled to hold talks with President Vladimir Putin on Friday.
It will be the Greek premier's second visit to Russia in less than three months, and although the Russian government has stressed that Greece has never requested direct financial aid, observers say Mr Tsipras is trying to send a message to Europe that he still has other cards to play.