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Greece needs an extra 50 billion euros over the next three years and significant debt relief to stay afloat, its creditors warned Thursday.
Less than 24 hours after he wrote a conciliatory letter to creditors asking for a new bailout, Tsipras abruptly switched back into combative mode.
Greece has overtaken Italy as the main entry point for those seeking refuge or a better life in Europe.
Greek PM Tsipras says a 'no' vote would step up pressure on creditors to give the country an economically viable agreement.
The Greek prime minister made concessions on major sticking points in a letter to eurozone ministers.
Agents are contacting major clubs to discuss what will happen the event of a Greek default.
Greece owes official lenders 242.8 billion euros ($271 billion).
The missed payment would bring Greece closer to a Euro exit if it prompted the European Central Bank to cut off emergency funding.
After an initial wave of selling, European stocks and the euro recovered some ground.
Tsipras asked Juncker to help get the program "extended by a few days and help restore the Greek banking system's liquidity."
Greece has less than 48 hours to pay back 1.6 billion euros ($1.77 billion) of International Monetary Fund loans.
Weekly arrivals of 5,000 migrants are putting Greece under enormous strain.
The eurozone common monetary policy is not fit for purpose for all eurozone member states
Greece's endemic democratic deficit is one of the root causes of the current economic crisis.
Meanwhile the Greek prime minister has landed in Russia.
58% of Germans now want Greece to leave, while the majority of Greeks want to stay.
The country's leaders and international creditors have failed to reach a deal over economic reforms.
Excessive fiscal policy tightening within a euro straitjacket is not a good idea.